Using [smtp\_tls\_security\_level](http://www.postfix.org/postconf.5.html#smtp_tls_security_level "smtp_tls_security_level") or [smtp\_tls\_policy\_maps](http://www.postfix.org/postconf.5.html#smtp_tls_policy_maps "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=<alice@example.org>, orig_to=<alice@example.org>, 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?