[Solved] Sylpheed can't send e-mail (but Thunderbird can so)

[Hetzer]

So?
Recently switched to Sylpheed from Thunderbird (reasons not relevant here)
Everything seemed to be okay till I had to send mail to someone outside mailserver: Sylpheed receives "Relay access denied"
I do receive mail, can read it and manage it (I mean, delete, move it to other folder et cetera)
It's definitely not server-side problem since Thunderbird is able to send e-mail:
_{example.net is my server, example.pl being that remote one}

Code: Select all

Feb 16 15:24:07 mejl postfix/submission/smtpd[74578]: connect from unknown[10.50.44.9]
Feb 16 15:24:07 mejl postfix/submission/smtpd[74578]: B799D5A0B3B: client=unknown[10.50.44.9], sasl_method=PLAIN, sasl_username=sender
Feb 16 15:24:07 mejl postfix/cleanup[74579]: B799D5A0B3B: message-id=<kebab502-3d27-49d9-a2e4-021b397632ca@example.net>
Feb 16 15:24:07 mejl postfix/qmgr[74076]: B799D5A0B3B: from=<sender@example.net>, size=117369, nrcpt=1 (queue active)
Feb 16 15:24:11 mejl postfix/smtp[74580]: B799D5A0B3B: to=<recipient@example.pl>, relay=mx.example.pl[282.77.101.4]:25, delay=3.4, delays=0.11/0.05/0.28/3, dsn=2.0.0, status=sent (250 ok 1708093456 qp 36751 mailid 478b435adf1d2240f4e0dbus6a67185c)
Feb 16 15:24:11 mejl postfix/qmgr[74076]: B799D5A0B3B: removed
Feb 16 15:24:17 mejl postfix/submission/smtpd[74578]: disconnect from unknown[10.50.44.9] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 commands=7

^{postfix log of mailserver; Thunderbird can send e-mails with no problems}

When Sylpheed tries to do the same:
_{"ambassador" is me computer's hostname}

Code: Select all

Feb 16 15:22:42 mejl postfix/smtpd[74552]: connect from unknown[10.50.44.9]
Feb 16 15:22:42 mejl postfix/smtpd[74552]: NOQUEUE: reject: RCPT from unknown[10.50.44.9]: 454 4.7.1 <recipient@example.pl>: Relay access denied; from=<sender@example.net> to=<recipient@example.pl> proto=ESMTP helo=<ambassador>
Feb 16 15:22:51 mejl postfix/smtpd[74552]: lost connection after RCPT from unknown[10.50.44.9]
Feb 16 15:22:51 mejl postfix/smtpd[74552]: disconnect from unknown[10.50.44.9] ehlo=2 starttls=1 mail=1 rcpt=0/1 commands=4/5

^{postfix log again; Sylpheed connects to SMTP but gets rejected when sending}
I see that postfix logs don't mention anything 'bout SASL in case of Sylpheed, so I guess it's where it fails
If important, server uses mandatory TLS both for IMAP and SMTP and Sylpheed is configured to use it (TLS for IMAP, STARTTLS for SMTP)

Any clues? It's matter of configuration or Sylpheed simply doesn't support SASL at all?

(Just in case: I made public IPs from logs invalid and IDs (iod36g75zkeg-like things) here got changed as well)

[CwF]

Any clues? It's matter of configuration or Sylpheed simply doesn't support SASL at all?

I think so. I can't remember the details but I was contacted by a provider a few years ago that I had 90-60-30 days to alter my access methods. Since then I still use sylpheed for local intranet and not external internet. Protocol was the issue and my take at the time was sylpheed was not to be used externally and I haven't revisited the issue. Not so helpful maybe. Email function decline is a sad thing.

[dilberts_left_nut]

The first uses postfix/submission/smtpd but second uses postfix/smtpd
Presumably you have different rules for each in postfix?

Check the "sending" port, and auth credentials, in Sylpheed.

[Hetzer]

Check the "sending" port, and auth credentials, in Sylpheed.

T'was it. Sylpheed used 25 as a default instead of submission on 587 and had disabled SMTP authentication

Now Sylpheed can into SASL (accordin' to logs) and send e-mail - thread therefore solved, I appreciate yer help

[CwF]

thread therefore solved, I

Excellent, and I can review my confusion! Please mark this solved by editing the title in the first post