gh-132796: Closes SMTP connection on 421 during data in sendmail #132797
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Fixes a minor issue in smtlib.SMTP.sendmail that leads to SMTP client connections not being closed when a server responds with 421 during a DATA command. The existing 421 handling covers almost all cases, but as the DATA command method already handles some error response codes, the 421 is masked for sendmail.
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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool. If this change has little impact on Python users, wait for a maintainer to apply the |
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Fixes a minor issue in smtlib.SMTP.sendmail that leads to SMTP client connections not being closed when a server responds with 421 during a DATA command. The existing 421 handling covers almost all cases, but as the DATA command method already handles some error response codes, the 421 is masked for sendmail.