On Friday 25 September 2020 12:56:50, PGNet Dev wrote:
I'm setting up an alternative submission relay host for dovecot. Atm, it's pointing @ fastmail.com.
with dovecot config,
submission_relay_host = smtp.fastmail.com submission_relay_port = 465 submission_relay_ssl = smtps submission_relay_ssl_verify = no submission_relay_trusted = yes submission_relay_user = 'acctID@mydomain.com' submission_relay_password = 'acctPWD'
submission relay via dovecot proxy works as expected -- mail's delivered/received by intended recipient.
in local dovecot logs I notice
==> /var/log/dovecot/dovecot.log <== 2020-09-24 16:22:19 submission(recipient@example.com)<xxxxxxxxxxxxxxxx>: Warning: smtp-client: conn smtp.fastmail.com:465 (66.111.4.140:465) [1]: Received invalid EHLO response line: Unexpected character in EHLO keyword
at debug level
==> /var/log/dovecot/dovecot-debug.log <== 2020-09-24 16:22:19 submission(recipient@example.com)<xxxxxxxxxxxxxxxx>: Debug: smtp-client: conn smtp.fastmail.com:465 (66.111.4.140:465) [1]: command EHLO: Got reply (1/1): 250 mail.messagingengine.com PIPELINING SIZE 73000000 AUTH DIGEST-MD5 CRAM-MD5 NTLM LOGIN PLAIN AUTH=DIGEST-MD5 CRAM-MD5 NTLM LOGIN PLAIN ENHANCEDSTATUSCODES 8BITMIME (1 commands pending, 0 commands queued)
it's clearly non-fatal, simply a warning.
i certainly do _not_ see this with every relay host, so suspect it's unique to fastmail's EHLO response. at least within the set of hosts I've tested.
i'd like to find/fix it ... either at my dovecot instance, or @ fastmail.
what's specifically invalid about
250 mail.messagingengine.com PIPELINING SIZE 73000000 AUTH DIGEST-MD5 CRAM-MD5 NTLM LOGIN PLAIN AUTH=DIGEST-MD5 CRAM-MD5 NTLM LOGIN PLAIN ENHANCEDSTATUSCODES 8BITMIME
by dovecot's 'measure'?
The "=" in AUTH=PLAIN.
See: https://dovecot.org/pipermail/dovecot/2020-September/119854.html
$ openssl s_client -connect smtp.fastmail.com:465
...
220 smtp.fastmail.com ESMTP ready
ehlo asdf
250-smtp.fastmail.com
250-PIPELINING
250-SIZE 71000000
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-AUTH PLAIN LOGIN
250 AUTH=PLAIN LOGINThanks, Alec