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Title: bpo-40597: email: Don't shy from using CTE for US-ASCII-only emails by ivyl · Pull Request #20038 · python/cpython · GitHub

Open Graph Title: bpo-40597: email: Don't shy from using CTE for US-ASCII-only emails by ivyl · Pull Request #20038 · python/cpython

X Title: bpo-40597: email: Don't shy from using CTE for US-ASCII-only emails by ivyl · Pull Request #20038 · python/cpython

Description: RFC5322 in section 2.1.1 mandates that the line cannot be longer than 998 characters and should not be longer than 78 characters (excluding CRLF). When we use raw_data_manager (default for EmailPolicy, EmailMessage) it does the correct thing as long as the message contains characters outside of 7bit US-ASCII set - base64 or qp Content-Transfer-Encoding is applied if the lines would be too long without it. However if our message is limited the characters from the 7bit US-ASCII set no transfer encoding is applied, and such messages can easily go beyond 78 or even 998 characters. Let's fix the CTE heuristic so it doesn't care about 7bit vs 8bit. https://bugs.python.org/issue40597

Open Graph Description: RFC5322 in section 2.1.1 mandates that the line cannot be longer than 998 characters and should not be longer than 78 characters (excluding CRLF). When we use raw_data_manager (default for EmailPol...

X Description: RFC5322 in section 2.1.1 mandates that the line cannot be longer than 998 characters and should not be longer than 78 characters (excluding CRLF). When we use raw_data_manager (default for EmailPol...

Opengraph URL: https://github.com/python/cpython/pull/20038

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