Hello, I read the “Postfix ETRN Howto” [1] as well as man 5 postconf with regards to:
postscreen_discard_ehlo_keywords smtpd_discard_ehlo_keywords ... and disabled the announcement of ETRN via: postscreen_discard_ehlo_keywords = ETRN smtpd_discard_ehlo_keywords = ETRN I then restarted the server and observed an inbound connection from Gmail: Feb 27 21:12:19 server postfix/smtpd[2369]: connect from mail-oi0-x22f.google.com Feb 27 21:12:19 server postfix/smtpd[2369]: discarding EHLO keywords: ETRN Feb 27 21:12:19 server postfix/smtpd[2369]: Trusted TLS connection established ... Feb 27 21:12:19 server postfix/smtpd[2369]: discarding EHLO keywords: ETRN My question is: ** Is the Gmail SMTP server attempting to use ETRN on the first, unencrypted SMTP session with my server and then attempting to request it again after STARTTLS when the TLS connection is established and this is why it is logging that it is discarding ETRN each time or ... ** Is Postfix logging that ETRN is disabled on the first, unencrypted SMTP session and then logging this again for the encrypted session (ie: Postfix is just logging I disabled this and Google is not attempting to issue ETRN each time) ? Thanks, - J Sources: [1] www.postfix.org/ETRN_README.html