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jornane
Asked: 2018-07-10 06:07:07 +0800 CST

Did Postfix deliver a mail via plain SMTP or STARTTLS?

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Using smtp_tls_security_level or smtp_tls_policy_maps I can make Postfix deliver outgoing mail via STARTTLS. However, the log file doesn't seem to tell me whether the mail was sent using TLS.

Jul  9 13:54:07 outgoing.example.com postfix/smtp[1337]: ABCDEF123: to=<[email protected]>, orig_to=<[email protected]>, relay=mx.example.org[192.0.2.25]:25, delay=1.4, delays=0.01/0/0.34/1, dsn=2.6.0, status=sent (250 2.6.0 Yum yum munch munch)

Is there a way to log per outgoing mail whether it was delivered using plain SMTP or STARTTLS?

ssl

2 Answers

  1. Change default configuration:
    smtp_tls_loglevel for outgoing connections
    smtpd_tls_loglevel for incoming connections

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  2. By default Postfix won't log any information about the connection when sending mail (although the recipient may still be able to learn such TLS information from a Received header) but you can increase the smtp_tls_loglevel from the default 0 to 1 or higher.

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