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Title: RFC 5322: Internet Message Format | RFC Editor

Open Graph Title: RFC 5322: Internet Message Format | RFC Editor

Description: This document specifies the Internet Message Format (IMF), a syntax for text messages that are sent between computer users, within the framework of "electronic mail" messages. This specification is a revision of Request For Comments (RFC) 2822, which itself superseded Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages", updating it to reflect current practice and incorporating incremental changes that were specified in other RFCs. [STANDARDS-TRACK]

Open Graph Description: This document specifies the Internet Message Format (IMF), a syntax for text messages that are sent between computer users, within the framework of "electronic mail" messages. This specification is a revision of Request For Comments (RFC) 2822, which itself superseded Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages", updating it to reflect current practice and incorporating incremental changes that were specified in other RFCs. [STANDARDS-TRACK]

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Opengraph URL: https://www.rfc-editor.org/info/rfc5322/

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og:imagehttps://www.rfc-editor.org/api/v1/meta-thumbnail/rfc5322.png
og:image:altRFC 5322: Internet Message Format. This document specifies the Internet Message Format (IMF), a syntax for text messages that are sent between computer users, within the framework of "electronic mail" messages. This specification is a revision of Request For Comments (RFC) 2822, which itself superseded Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages", updating it to reflect current practice and incorporating incremental changes that were specified in other RFCs. [STANDARDS-TRACK].
og:image:typeimage/png
og:image:width1200
og:image:height630
og:typearticle
article:modified_time2008-10-01
resource-timestamp:info-rfc53222026-06-22T20:29:37.312+00:00
citation_authorP. Resnick
citation_doi10.17487/RFC5322
citation_publication_date2008/10/01
citation_technical_report_numberrfc5322
citation_titleInternet Message Format

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RFC 6854https://www.rfc-editor.org/info/rfc6854/
2822https://www.rfc-editor.org/info/rfc2822/
4021https://www.rfc-editor.org/info/rfc4021/
2822https://www.rfc-editor.org/info/rfc2822/
822https://www.rfc-editor.org/info/rfc822/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
1https://www.rfc-editor.org/rfc/rfc5322#section-1
4https://www.rfc-editor.org/rfc/rfc5322#page-4
1.1https://www.rfc-editor.org/rfc/rfc5322#section-1.1
4https://www.rfc-editor.org/rfc/rfc5322#page-4
1.2https://www.rfc-editor.org/rfc/rfc5322#section-1.2
5https://www.rfc-editor.org/rfc/rfc5322#page-5
1.2.1https://www.rfc-editor.org/rfc/rfc5322#section-1.2.1
5https://www.rfc-editor.org/rfc/rfc5322#page-5
1.2.2https://www.rfc-editor.org/rfc/rfc5322#section-1.2.2
5https://www.rfc-editor.org/rfc/rfc5322#page-5
1.2.3https://www.rfc-editor.org/rfc/rfc5322#section-1.2.3
5https://www.rfc-editor.org/rfc/rfc5322#page-5
2https://www.rfc-editor.org/rfc/rfc5322#section-2
6https://www.rfc-editor.org/rfc/rfc5322#page-6
2.1https://www.rfc-editor.org/rfc/rfc5322#section-2.1
6https://www.rfc-editor.org/rfc/rfc5322#page-6
2.1.1https://www.rfc-editor.org/rfc/rfc5322#section-2.1.1
7https://www.rfc-editor.org/rfc/rfc5322#page-7
2.2https://www.rfc-editor.org/rfc/rfc5322#section-2.2
8https://www.rfc-editor.org/rfc/rfc5322#page-8
2.2.1https://www.rfc-editor.org/rfc/rfc5322#section-2.2.1
8https://www.rfc-editor.org/rfc/rfc5322#page-8
2.2.2https://www.rfc-editor.org/rfc/rfc5322#section-2.2.2
8https://www.rfc-editor.org/rfc/rfc5322#page-8
2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
8https://www.rfc-editor.org/rfc/rfc5322#page-8
2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.3
9https://www.rfc-editor.org/rfc/rfc5322#page-9
3https://www.rfc-editor.org/rfc/rfc5322#section-3
10https://www.rfc-editor.org/rfc/rfc5322#page-10
3.1https://www.rfc-editor.org/rfc/rfc5322#section-3.1
10https://www.rfc-editor.org/rfc/rfc5322#page-10
3.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2
10https://www.rfc-editor.org/rfc/rfc5322#page-10
3.2.1https://www.rfc-editor.org/rfc/rfc5322#section-3.2.1
10https://www.rfc-editor.org/rfc/rfc5322#page-10
3.2.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2.2
11https://www.rfc-editor.org/rfc/rfc5322#page-11
3.2.3https://www.rfc-editor.org/rfc/rfc5322#section-3.2.3
12https://www.rfc-editor.org/rfc/rfc5322#page-12
3.2.4https://www.rfc-editor.org/rfc/rfc5322#section-3.2.4
13https://www.rfc-editor.org/rfc/rfc5322#page-13
3.2.5https://www.rfc-editor.org/rfc/rfc5322#section-3.2.5
14https://www.rfc-editor.org/rfc/rfc5322#page-14
3.3https://www.rfc-editor.org/rfc/rfc5322#section-3.3
14https://www.rfc-editor.org/rfc/rfc5322#page-14
3.4https://www.rfc-editor.org/rfc/rfc5322#section-3.4
16https://www.rfc-editor.org/rfc/rfc5322#page-16
3.4.1https://www.rfc-editor.org/rfc/rfc5322#section-3.4.1
17https://www.rfc-editor.org/rfc/rfc5322#page-17
3.5https://www.rfc-editor.org/rfc/rfc5322#section-3.5
18https://www.rfc-editor.org/rfc/rfc5322#page-18
3.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6
19https://www.rfc-editor.org/rfc/rfc5322#page-19
3.6.1https://www.rfc-editor.org/rfc/rfc5322#section-3.6.1
22https://www.rfc-editor.org/rfc/rfc5322#page-22
3.6.2https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
22https://www.rfc-editor.org/rfc/rfc5322#page-22
3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
23https://www.rfc-editor.org/rfc/rfc5322#page-23
3.6.4https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
25https://www.rfc-editor.org/rfc/rfc5322#page-25
3.6.5https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
27https://www.rfc-editor.org/rfc/rfc5322#page-27
3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
28https://www.rfc-editor.org/rfc/rfc5322#page-28
3.6.7https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
30https://www.rfc-editor.org/rfc/rfc5322#page-30
3.6.8https://www.rfc-editor.org/rfc/rfc5322#section-3.6.8
30https://www.rfc-editor.org/rfc/rfc5322#page-30
4https://www.rfc-editor.org/rfc/rfc5322#section-4
31https://www.rfc-editor.org/rfc/rfc5322#page-31
4.1https://www.rfc-editor.org/rfc/rfc5322#section-4.1
32https://www.rfc-editor.org/rfc/rfc5322#page-32
4.2https://www.rfc-editor.org/rfc/rfc5322#section-4.2
33https://www.rfc-editor.org/rfc/rfc5322#page-33
4.3https://www.rfc-editor.org/rfc/rfc5322#section-4.3
33https://www.rfc-editor.org/rfc/rfc5322#page-33
4.4https://www.rfc-editor.org/rfc/rfc5322#section-4.4
35https://www.rfc-editor.org/rfc/rfc5322#page-35
4.5https://www.rfc-editor.org/rfc/rfc5322#section-4.5
35https://www.rfc-editor.org/rfc/rfc5322#page-35
4.5.1https://www.rfc-editor.org/rfc/rfc5322#section-4.5.1
36https://www.rfc-editor.org/rfc/rfc5322#page-36
4.5.2https://www.rfc-editor.org/rfc/rfc5322#section-4.5.2
36https://www.rfc-editor.org/rfc/rfc5322#page-36
4.5.3https://www.rfc-editor.org/rfc/rfc5322#section-4.5.3
37https://www.rfc-editor.org/rfc/rfc5322#page-37
4.5.4https://www.rfc-editor.org/rfc/rfc5322#section-4.5.4
37https://www.rfc-editor.org/rfc/rfc5322#page-37
4.5.5https://www.rfc-editor.org/rfc/rfc5322#section-4.5.5
37https://www.rfc-editor.org/rfc/rfc5322#page-37
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4.5.6https://www.rfc-editor.org/rfc/rfc5322#section-4.5.6
38https://www.rfc-editor.org/rfc/rfc5322#page-38
4.5.7https://www.rfc-editor.org/rfc/rfc5322#section-4.5.7
38https://www.rfc-editor.org/rfc/rfc5322#page-38
4.5.8https://www.rfc-editor.org/rfc/rfc5322#section-4.5.8
38https://www.rfc-editor.org/rfc/rfc5322#page-38
5https://www.rfc-editor.org/rfc/rfc5322#section-5
38https://www.rfc-editor.org/rfc/rfc5322#page-38
6https://www.rfc-editor.org/rfc/rfc5322#section-6
39https://www.rfc-editor.org/rfc/rfc5322#page-39
Appendix Ahttps://www.rfc-editor.org/rfc/rfc5322#appendix-A
43https://www.rfc-editor.org/rfc/rfc5322#page-43
Appendix A.1https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1
44https://www.rfc-editor.org/rfc/rfc5322#page-44
Appendix A.1.1https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.1
44https://www.rfc-editor.org/rfc/rfc5322#page-44
Appendix A.1.2https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.2
45https://www.rfc-editor.org/rfc/rfc5322#page-45
Appendix A.1.3https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.3
45https://www.rfc-editor.org/rfc/rfc5322#page-45
Appendix A.2https://www.rfc-editor.org/rfc/rfc5322#appendix-A.2
46https://www.rfc-editor.org/rfc/rfc5322#page-46
Appendix A.3https://www.rfc-editor.org/rfc/rfc5322#appendix-A.3
47https://www.rfc-editor.org/rfc/rfc5322#page-47
Appendix A.4https://www.rfc-editor.org/rfc/rfc5322#appendix-A.4
48https://www.rfc-editor.org/rfc/rfc5322#page-48
Appendix A.5https://www.rfc-editor.org/rfc/rfc5322#appendix-A.5
49https://www.rfc-editor.org/rfc/rfc5322#page-49
Appendix A.6https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6
50https://www.rfc-editor.org/rfc/rfc5322#page-50
Appendix A.6.1https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.1
50https://www.rfc-editor.org/rfc/rfc5322#page-50
Appendix A.6.2https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.2
50https://www.rfc-editor.org/rfc/rfc5322#page-50
Appendix A.6.3https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.3
51https://www.rfc-editor.org/rfc/rfc5322#page-51
Appendix Bhttps://www.rfc-editor.org/rfc/rfc5322#appendix-B
52https://www.rfc-editor.org/rfc/rfc5322#page-52
Appendix Chttps://www.rfc-editor.org/rfc/rfc5322#appendix-C
53https://www.rfc-editor.org/rfc/rfc5322#page-53
7https://www.rfc-editor.org/rfc/rfc5322#section-7
55https://www.rfc-editor.org/rfc/rfc5322#page-55
7.1https://www.rfc-editor.org/rfc/rfc5322#section-7.1
55https://www.rfc-editor.org/rfc/rfc5322#page-55
7.2https://www.rfc-editor.org/rfc/rfc5322#section-7.2
55https://www.rfc-editor.org/rfc/rfc5322#page-55
RFC 5322https://www.rfc-editor.org/info/rfc5322/
1https://www.rfc-editor.org/rfc/rfc5322#section-1
1.1https://www.rfc-editor.org/rfc/rfc5322#section-1.1
RFC2822https://www.rfc-editor.org/info/rfc2822/
RFC0822https://www.rfc-editor.org/info/rfc0822/
RFC1123https://www.rfc-editor.org/info/rfc1123/
RFC2045https://www.rfc-editor.org/info/rfc2045/
RFC2046https://www.rfc-editor.org/info/rfc2046/
RFC2049https://www.rfc-editor.org/info/rfc2049/
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
1.2https://www.rfc-editor.org/rfc/rfc5322#section-1.2
1.2.1https://www.rfc-editor.org/rfc/rfc5322#section-1.2.1
RFC2119https://www.rfc-editor.org/info/rfc2119/
1.2.2https://www.rfc-editor.org/rfc/rfc5322#section-1.2.2
RFC5234https://www.rfc-editor.org/info/rfc5234/
1.2.3https://www.rfc-editor.org/rfc/rfc5322#section-1.2.3
section 1https://www.rfc-editor.org/rfc/rfc5322#section-1
Section 2https://www.rfc-editor.org/rfc/rfc5322#section-2
Section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
2https://www.rfc-editor.org/rfc/rfc5322#section-2
3https://www.rfc-editor.org/rfc/rfc5322#section-3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Section 4https://www.rfc-editor.org/rfc/rfc5322#section-4
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
Section 5https://www.rfc-editor.org/rfc/rfc5322#section-5
Appendix Ahttps://www.rfc-editor.org/rfc/rfc5322#appendix-A
Appendix Bhttps://www.rfc-editor.org/rfc/rfc5322#appendix-B
Appendix Chttps://www.rfc-editor.org/rfc/rfc5322#appendix-C
2https://www.rfc-editor.org/rfc/rfc5322#section-2
2.1https://www.rfc-editor.org/rfc/rfc5322#section-2.1
ANSI.X3-4.1986https://www.rfc-editor.org/rfc/rfc5322#ref-ANSI.X3-4.1986
RFC2045https://www.rfc-editor.org/info/rfc2045/
RFC2046https://www.rfc-editor.org/info/rfc2046/
RFC2047https://www.rfc-editor.org/info/rfc2047/
RFC2049https://www.rfc-editor.org/info/rfc2049/
RFC4288https://www.rfc-editor.org/info/rfc4288/
RFC4289https://www.rfc-editor.org/info/rfc4289/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
2.1.1https://www.rfc-editor.org/rfc/rfc5322#section-2.1.1
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
2.2https://www.rfc-editor.org/rfc/rfc5322#section-2.2
sectionhttps://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
3https://www.rfc-editor.org/rfc/rfc5322#section-3
4https://www.rfc-editor.org/rfc/rfc5322#section-4
2.2.1https://www.rfc-editor.org/rfc/rfc5322#section-2.2.1
section 3.2.5https://www.rfc-editor.org/rfc/rfc5322#section-3.2.5
section 2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
2.2.2https://www.rfc-editor.org/rfc/rfc5322#section-2.2.2
3https://www.rfc-editor.org/rfc/rfc5322#section-3
4https://www.rfc-editor.org/rfc/rfc5322#section-4
section 3.2.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2.2
section 2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.3
RFC2045https://www.rfc-editor.org/info/rfc2045/
RFC2046https://www.rfc-editor.org/info/rfc2046/
RFC2049https://www.rfc-editor.org/info/rfc2049/
RFC4288https://www.rfc-editor.org/info/rfc4288/
RFC4289https://www.rfc-editor.org/info/rfc4289/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3https://www.rfc-editor.org/rfc/rfc5322#section-3
3.1https://www.rfc-editor.org/rfc/rfc5322#section-3.1
RFC5234https://www.rfc-editor.org/info/rfc5234/
Appendixhttps://www.rfc-editor.org/rfc/rfc5322#appendix-B.1
B.1https://www.rfc-editor.org/rfc/rfc5322#appendix-B.1
section 4https://www.rfc-editor.org/rfc/rfc5322#section-4
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
section 4https://www.rfc-editor.org/rfc/rfc5322#section-4
3.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2
section 3.2.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2.2
3.2.1https://www.rfc-editor.org/rfc/rfc5322#section-3.2.1
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 4https://www.rfc-editor.org/rfc/rfc5322#section-4
3.2.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2.2
section 2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
section 3.2.4https://www.rfc-editor.org/rfc/rfc5322#section-3.2.4
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 2.2.3https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
3.2.3https://www.rfc-editor.org/rfc/rfc5322#section-3.2.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.2.4https://www.rfc-editor.org/rfc/rfc5322#section-3.2.4
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.2.5https://www.rfc-editor.org/rfc/rfc5322#section-3.2.5
3.3https://www.rfc-editor.org/rfc/rfc5322#section-3.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC1305https://www.rfc-editor.org/info/rfc1305/
3.4https://www.rfc-editor.org/rfc/rfc5322#section-3.4
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 3.4.1https://www.rfc-editor.org/rfc/rfc5322#section-3.4.1
3.4.1https://www.rfc-editor.org/rfc/rfc5322#section-3.4.1
RFC1034https://www.rfc-editor.org/info/rfc1034/
RFC1035https://www.rfc-editor.org/info/rfc1035/
RFC1123https://www.rfc-editor.org/info/rfc1123/
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC1034https://www.rfc-editor.org/info/rfc1034/
RFC1035https://www.rfc-editor.org/info/rfc1035/
RFC1123https://www.rfc-editor.org/info/rfc1123/
RFC5321https://www.rfc-editor.org/info/rfc5321/
3.5https://www.rfc-editor.org/rfc/rfc5322#section-3.5
section 2.1.1https://www.rfc-editor.org/rfc/rfc5322#section-2.1.1
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 3.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6
3.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6
3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
3.6.7https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.6.1https://www.rfc-editor.org/rfc/rfc5322#section-3.6.1
3.6.2https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
RFC 5322https://www.rfc-editor.org/info/rfc5322/
sectionhttps://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.6.4https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
section 3.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6
RFC1034https://www.rfc-editor.org/info/rfc1034/
RFC1035https://www.rfc-editor.org/info/rfc1035/
RFC1123https://www.rfc-editor.org/info/rfc1123/
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 3.6.7https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.6.5https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
sectionhttps://www.rfc-editor.org/rfc/rfc5322#section-2.2.1
2.2.1https://www.rfc-editor.org/rfc/rfc5322#section-2.2.1
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
3.6.7https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC5321https://www.rfc-editor.org/info/rfc5321/
3.6.8https://www.rfc-editor.org/rfc/rfc5322#section-3.6.8
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4https://www.rfc-editor.org/rfc/rfc5322#section-4
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
section 3.2.2https://www.rfc-editor.org/rfc/rfc5322#section-3.2.2
section 4.2https://www.rfc-editor.org/rfc/rfc5322#section-4.2
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4.1https://www.rfc-editor.org/rfc/rfc5322#section-4.1
section 4.4https://www.rfc-editor.org/rfc/rfc5322#section-4.4
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4.2https://www.rfc-editor.org/rfc/rfc5322#section-4.2
4.3https://www.rfc-editor.org/rfc/rfc5322#section-4.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC0822https://www.rfc-editor.org/info/rfc0822/
RFC0822https://www.rfc-editor.org/info/rfc0822/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4.4https://www.rfc-editor.org/rfc/rfc5322#section-4.4
4.5https://www.rfc-editor.org/rfc/rfc5322#section-4.5
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 4.5.3https://www.rfc-editor.org/rfc/rfc5322#section-4.5.3
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
4.5.1https://www.rfc-editor.org/rfc/rfc5322#section-4.5.1
4.5.2https://www.rfc-editor.org/rfc/rfc5322#section-4.5.2
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4.5.3https://www.rfc-editor.org/rfc/rfc5322#section-4.5.3
4.5.4https://www.rfc-editor.org/rfc/rfc5322#section-4.5.4
4.5.5https://www.rfc-editor.org/rfc/rfc5322#section-4.5.5
RFC 5322https://www.rfc-editor.org/info/rfc5322/
4.5.6https://www.rfc-editor.org/rfc/rfc5322#section-4.5.6
4.5.7https://www.rfc-editor.org/rfc/rfc5322#section-4.5.7
section 3https://www.rfc-editor.org/rfc/rfc5322#section-3
RFC5321https://www.rfc-editor.org/info/rfc5321/
4.5.8https://www.rfc-editor.org/rfc/rfc5322#section-4.5.8
5https://www.rfc-editor.org/rfc/rfc5322#section-5
RFC 5322https://www.rfc-editor.org/info/rfc5322/
ISO.2022.1994https://www.rfc-editor.org/rfc/rfc5322#ref-ISO.2022.1994
RFC2045https://www.rfc-editor.org/info/rfc2045/
RFC2046https://www.rfc-editor.org/info/rfc2046/
RFC2047https://www.rfc-editor.org/info/rfc2047/
RFC2049https://www.rfc-editor.org/info/rfc2049/
RFC4288https://www.rfc-editor.org/info/rfc4288/
RFC4289https://www.rfc-editor.org/info/rfc4289/
RFC2045https://www.rfc-editor.org/info/rfc2045/
RFC2046https://www.rfc-editor.org/info/rfc2046/
RFC2047https://www.rfc-editor.org/info/rfc2047/
RFC2049https://www.rfc-editor.org/info/rfc2049/
RFC4288https://www.rfc-editor.org/info/rfc4288/
RFC4289https://www.rfc-editor.org/info/rfc4289/
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
6https://www.rfc-editor.org/rfc/rfc5322#section-6
RFC4021https://www.rfc-editor.org/info/rfc4021/
RFC2822https://www.rfc-editor.org/info/rfc2822/
RFC3864https://www.rfc-editor.org/info/rfc3864/
section 3.6.1https://www.rfc-editor.org/rfc/rfc5322#section-3.6.1
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 3.6.2https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
section 3.6.2https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
section 3.6.2https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
section 3.6.3https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
section 3.6.4https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
section 3.6.4https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 3.6.4https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
section 3.6.5https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
section 3.6.5https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
section 3.6.5https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
RFC 5322https://www.rfc-editor.org/info/rfc5322/
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
section 4.5.6https://www.rfc-editor.org/rfc/rfc5322#section-4.5.6
section 3.6.6https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
section 3.6.7https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
section 3.6.7https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix Ahttps://www.rfc-editor.org/rfc/rfc5322#appendix-A
3https://www.rfc-editor.org/rfc/rfc5322#section-3
4https://www.rfc-editor.org/rfc/rfc5322#section-4
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.1https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1
Appendix A.1.1https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.1
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.1.2https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.2
Appendix A.1.3https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.2https://www.rfc-editor.org/rfc/rfc5322#appendix-A.2
section 3.6.5https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.3https://www.rfc-editor.org/rfc/rfc5322#appendix-A.3
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.4https://www.rfc-editor.org/rfc/rfc5322#appendix-A.4
RFC5321https://www.rfc-editor.org/info/rfc5321/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.5https://www.rfc-editor.org/rfc/rfc5322#appendix-A.5
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.6https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6
section 4https://www.rfc-editor.org/rfc/rfc5322#section-4
Appendix A.6.1https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.1
Appendix A.6.2https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.2
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix A.6.3https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.3
section 4.2https://www.rfc-editor.org/rfc/rfc5322#section-4.2
RFC 5322https://www.rfc-editor.org/info/rfc5322/
Appendix Bhttps://www.rfc-editor.org/rfc/rfc5322#appendix-B
RFC0822https://www.rfc-editor.org/info/rfc0822/
RFC1123https://www.rfc-editor.org/info/rfc1123/
RFC2822https://www.rfc-editor.org/info/rfc2822/
section 4https://www.rfc-editor.org/rfc/rfc5322#section-4
RFC0822https://www.rfc-editor.org/info/rfc0822/
RFC1123https://www.rfc-editor.org/info/rfc1123/
RFC2822https://www.rfc-editor.org/info/rfc2822/
RFC5234https://www.rfc-editor.org/info/rfc5234/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC2822https://www.rfc-editor.org/info/rfc2822/
Appendix Chttps://www.rfc-editor.org/rfc/rfc5322#appendix-C
RFC2822https://www.rfc-editor.org/info/rfc2822/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
7https://www.rfc-editor.org/rfc/rfc5322#section-7
7.1https://www.rfc-editor.org/rfc/rfc5322#section-7.1
RFC 1034https://www.rfc-editor.org/info/rfc1034/
RFC 1035https://www.rfc-editor.org/info/rfc1035/
RFC 1123https://www.rfc-editor.org/info/rfc1123/
BCP 14https://www.rfc-editor.org/bcp/bcp14
RFC 2119https://www.rfc-editor.org/info/rfc2119/
RFC 5234https://www.rfc-editor.org/info/rfc5234/
7.2https://www.rfc-editor.org/rfc/rfc5322#section-7.2
RFC 822https://www.rfc-editor.org/info/rfc822/
RFC 1305https://www.rfc-editor.org/info/rfc1305/
RFC 2045https://www.rfc-editor.org/info/rfc2045/
RFC 2046https://www.rfc-editor.org/info/rfc2046/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
RFC 2047https://www.rfc-editor.org/info/rfc2047/
RFC 2049https://www.rfc-editor.org/info/rfc2049/
RFC 2822https://www.rfc-editor.org/info/rfc2822/
BCP 90https://www.rfc-editor.org/bcp/bcp90
RFC 3864https://www.rfc-editor.org/info/rfc3864/
RFC 4021https://www.rfc-editor.org/info/rfc4021/
BCP 13https://www.rfc-editor.org/bcp/bcp13
RFC 4288https://www.rfc-editor.org/info/rfc4288/
BCP 13https://www.rfc-editor.org/bcp/bcp13
RFC 4289https://www.rfc-editor.org/info/rfc4289/
RFC 5321https://www.rfc-editor.org/info/rfc5321/
http://www.qualcomm.com/~presnick/http://www.qualcomm.com/~presnick/
RFC 5322https://www.rfc-editor.org/info/rfc5322/
BCP 78https://www.rfc-editor.org/bcp/bcp78
BCP 78https://www.rfc-editor.org/bcp/bcp78
BCP 79https://www.rfc-editor.org/bcp/bcp79
http://www.ietf.org/iprhttp://www.ietf.org/ipr
1. Introduction https://www.rfc-editor.org/rfc/rfc5322#section-1
1.1. Scope https://www.rfc-editor.org/rfc/rfc5322#section-1.1
1.2. Notational Conventions https://www.rfc-editor.org/rfc/rfc5322#section-1.2
1.2.1. Requirements Notation https://www.rfc-editor.org/rfc/rfc5322#section-1.2.1
1.2.2. Syntactic Notation https://www.rfc-editor.org/rfc/rfc5322#section-1.2.2
1.2.3. Structure of This Document https://www.rfc-editor.org/rfc/rfc5322#section-1.2.3
2. Lexical Analysis of Messages https://www.rfc-editor.org/rfc/rfc5322#section-2
2.1. General Description https://www.rfc-editor.org/rfc/rfc5322#section-2.1
2.1.1. Line Length Limits https://www.rfc-editor.org/rfc/rfc5322#section-2.1.1
2.2. Header Fields https://www.rfc-editor.org/rfc/rfc5322#section-2.2
2.2.1. Unstructured Header Field Bodies https://www.rfc-editor.org/rfc/rfc5322#section-2.2.1
2.2.2. Structured Header Field Bodies https://www.rfc-editor.org/rfc/rfc5322#section-2.2.2
2.2.3. Long Header Fields https://www.rfc-editor.org/rfc/rfc5322#section-2.2.3
2.3. Body https://www.rfc-editor.org/rfc/rfc5322#section-2.3
3. Syntax https://www.rfc-editor.org/rfc/rfc5322#section-3
3.1. Introduction https://www.rfc-editor.org/rfc/rfc5322#section-3.1
3.2. Lexical Tokens https://www.rfc-editor.org/rfc/rfc5322#section-3.2
3.2.1. Quoted characters https://www.rfc-editor.org/rfc/rfc5322#section-3.2.1
3.2.2. Folding White Space and Comments https://www.rfc-editor.org/rfc/rfc5322#section-3.2.2
3.2.3. Atom https://www.rfc-editor.org/rfc/rfc5322#section-3.2.3
3.2.4. Quoted Strings https://www.rfc-editor.org/rfc/rfc5322#section-3.2.4
3.2.5. Miscellaneous Tokens https://www.rfc-editor.org/rfc/rfc5322#section-3.2.5
3.3. Date and Time Specification https://www.rfc-editor.org/rfc/rfc5322#section-3.3
3.4. Address Specification https://www.rfc-editor.org/rfc/rfc5322#section-3.4
3.4.1. Addr-Spec Specification https://www.rfc-editor.org/rfc/rfc5322#section-3.4.1
3.5. Overall Message Syntax https://www.rfc-editor.org/rfc/rfc5322#section-3.5
3.6. Field Definitions https://www.rfc-editor.org/rfc/rfc5322#section-3.6
3.6.1. The Origination Date Field https://www.rfc-editor.org/rfc/rfc5322#section-3.6.1
3.6.2. Originator Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
3.6.3. Destination Address Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.3
3.6.4. Identification Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
3.6.5. Informational Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5
3.6.6. Resent Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.6
3.6.7. Trace Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.7
3.6.8. Optional Fields https://www.rfc-editor.org/rfc/rfc5322#section-3.6.8
4. Obsolete Syntax https://www.rfc-editor.org/rfc/rfc5322#section-4
4.1. Miscellaneous Obsolete Tokens https://www.rfc-editor.org/rfc/rfc5322#section-4.1
4.2. Obsolete Folding White Space https://www.rfc-editor.org/rfc/rfc5322#section-4.2
4.3. Obsolete Date and Time https://www.rfc-editor.org/rfc/rfc5322#section-4.3
4.4. Obsolete Addressing https://www.rfc-editor.org/rfc/rfc5322#section-4.4
4.5. Obsolete Header Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5
4.5.1. Obsolete Origination Date Field https://www.rfc-editor.org/rfc/rfc5322#section-4.5.1
4.5.2. Obsolete Originator Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.2
4.5.3. Obsolete Destination Address Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.3
4.5.4. Obsolete Identification Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.4
4.5.5. Obsolete Informational Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.5
4.5.6. Obsolete Resent Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.6
4.5.7. Obsolete Trace Fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.7
4.5.8. Obsolete optional fields https://www.rfc-editor.org/rfc/rfc5322#section-4.5.8
5. Security Considerations https://www.rfc-editor.org/rfc/rfc5322#section-5
6. IANA Considerations https://www.rfc-editor.org/rfc/rfc5322#section-6
Appendix A. Example Messages https://www.rfc-editor.org/rfc/rfc5322#appendix-A
Appendix A.1. Addressing Examples https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1
Appendix A.1.1. A Message from One Person to Another with Simple https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.1
Appendix A.1.2. Different Types of Mailboxes https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.2
Appendix A.1.3. Group Addresses https://www.rfc-editor.org/rfc/rfc5322#appendix-A.1.3
Appendix A.2. Reply Messages https://www.rfc-editor.org/rfc/rfc5322#appendix-A.2
Appendix A.3. Resent Messages https://www.rfc-editor.org/rfc/rfc5322#appendix-A.3
Appendix A.4. Messages with Trace Fields https://www.rfc-editor.org/rfc/rfc5322#appendix-A.4
Appendix A.5. White Space, Comments, and Other Oddities https://www.rfc-editor.org/rfc/rfc5322#appendix-A.5
Appendix A.6. Obsoleted Forms https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6
Appendix A.6.1. Obsolete Addressing https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.1
Appendix A.6.2. Obsolete Dates https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.2
Appendix A.6.3. Obsolete White Space and Comments https://www.rfc-editor.org/rfc/rfc5322#appendix-A.6.3
Appendix B. Differences from Earlier Specifications https://www.rfc-editor.org/rfc/rfc5322#appendix-B
Appendix C. Acknowledgements https://www.rfc-editor.org/rfc/rfc5322#appendix-C
7. References https://www.rfc-editor.org/rfc/rfc5322#section-7
7.1. Normative References https://www.rfc-editor.org/rfc/rfc5322#section-7.1
7.2. Informative References https://www.rfc-editor.org/rfc/rfc5322#section-7.2
RFC 4021: Registration of Mail and MIME Header Fieldshttps://www.rfc-editor.org/info/rfc4021/
RFC 6854: Update to Internet Message Format to Allow Group Syntax in the "From:" and "Sender:" Header Fieldshttps://www.rfc-editor.org/info/rfc6854/
RFC 2822: Internet Message Formathttps://www.rfc-editor.org/info/rfc2822/
P. Resnickhttps://datatracker.ietf.org/person/Pete%20Resnick
IETFhttps://www.ietf.org
https://doi.org/10.17487/RFC5322https://doi.org/10.17487/RFC5322
TXThttps://www.rfc-editor.org/rfc/rfc5322.txt
HTMLhttps://www.rfc-editor.org/rfc/rfc5322.html
TXThttps://www.rfc-editor.org/refs/ref5322.txt
XMLhttps://bib.ietf.org/public/rfc/bibxml/reference.RFC.5322.xml
BibTeXhttps://datatracker.ietf.org/doc/rfc5322/bibtex/
RFC 5322 Erratahttps://errata.rfc-editor.org/search/?rfc_number=5322
Internet Engineering Task Force https://www.ietf.org
https://www.ietf.org
System Statushttps://status.ietf.org
Report a Bughttps://github.com/ietf-tools/red/issues
IETF.orghttps://www.ietf.org
IRTF.orghttps://www.irtf.org
IAB.orghttps://www.iab.org
Datatrackerhttps://datatracker.ietf.org
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