When detect_auth_support subroutine tests SMTP authentication, it checks only 535, 502 and 503 error codes. According to RFC 2554 unsupported authentication mechanisms are rejected with 504 error.
Checked conf.pl in 1.5.2svn (2007-05-28) and 1.4.10. Used hmailserver 4.4 for testing (login is supported, cram-md5 and digest-md5 are not).
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