smtplib: catch OSError, not SMTPException #2139
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Some, but not all, types of connection error are caught by smtplib and reraised as an smtplib.SMTPException. Notably, TimeoutError, socket.gaierror (name resolution failure), and ConnectionRefusedError and are not caught. The more generic OSError should be caught here instead. Resolves #1905
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A backport of a upstream patch for RHEL 9.6.
Upstream commit: aab7def
Resolves: https://issues.redhat.com/browse/RHEL-49743