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Reusing an SMTP or LMTP instance can retain the previous connection's greeting and ESMTP capabilities, preventing the new server from being greeted. Clear that state after socket establishment and before reading the greeting. Cover SMTP, TCP LMTP, Unix-socket LMTP, and connection/greeting failures.
Fixes #85642.
Validation (Windows debug build):
test_smtplibpassed (88 tests run, 1 skipped); reconnect, socket-failure, and greeting-failure cases were exercised with mocked sockets. The isolated patch applies cleanly to the base revision.