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TalkTalk SMTP server rejecting some connexions (but not all).

gmlack
Super Duper Contributor
Private Message TalkTalk

on ‎03-11-2025 05:33 PM

Message 44 of 44

I send my email via a local SMTP server (mine - Postfix).

This has worked well for several years.

 

But this morning, when I tried to send an email to 7 recipients, it failed and the log of connexions to TalkTalk shows:

 

2025-11-03T11:17:52.300609+00:00 benuc postfix/qmgr[1993]: 3699C5F2CB: from=<MyAccount@dsl.pipex.com>, size=3070, nrcpt=7 (queue active)
2025-11-03T11:17:57.392258+00:00 benuc postfix/smtpd[356593]: disconnect from mylaptop.homenet[192.168.1.10] ehlo=2 starttls=1 auth=1 mail=1 rcpt=7 data=1 quit=1 commands=14
2025-11-03T11:17:59.968276+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt1@btinternet.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, dsn
=4.7.1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))
2025-11-03T11:17:59.970646+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt2@btinternet.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, dsn
=4.7.1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))
2025-11-03T11:17:59.973066+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt3@gmail.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, dsn=4.7.
1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))
2025-11-03T11:17:59.976523+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt4@gmail.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, dsn=4.7.
1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))
2025-11-03T11:17:59.978996+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt5@gmail.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, dsn=4.7.
1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))
2025-11-03T11:17:59.981324+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt6@hotmail.co.uk>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, dsn=
4.7.1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))
2025-11-03T11:17:59.984062+00:00 benuc postfix/smtp[356597]: 3699C5F2CB: to=<Rcpt7@example.plus.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=7.7, delays=0.09/0.02/0.26/7.3, d
sn=4.7.1, status=SOFTBOUNCE (host smtp.talktalk.net[153.92.174.230] said: 550 5.7.1  Reject for policy reason (in reply to end of DATA command))

It continues to give this response every time the Postfix server tries resending.

 

It appears that I can send emails to 1 addressee, e.g.:

2025-11-03T16:45:00.112865+00:00 benuc postfix/qmgr[1993]: 1401C5F419: from=<MyAccount@dsl.pipex.com>, size=2041, nrcpt=1 (queue active)
2025-11-03T16:45:01.591676+00:00 benuc postfix/smtp[371777]: 1401C5F419: to=<Rcpt1@icloud.com>, relay=smtp.talktalk.net[153.92.174.230]:587, delay=1.5, delays=0.05/0.01/0.25/1.2, dsn=2.0
.0, status=sent (250 2.0.0 Ok: queued as 64308A40142)
2025-11-03T16:45:01.592070+00:00 benuc postfix/qmgr[1993]: 1401C5F419: removed

so there's nothing wrong with authentication (and, indeed, I'm receiving incoming mail OK).

 

 

So, what has changed on the TalkTalk SMTP server (nothing changed at my end).?

 

Labels:
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43 REPLIES 43

gmlack
Super Duper Contributor
Private Message TalkTalk
In response to Philile-TT

on ‎04-11-2025 12:43 PM

Message 41 of 44

No. I'm talking to the SMTP server at smtp.talktalk.net.

 

I'm also seeing occasional SMTP auth failures:

5.7.8 Error: authentication failed: (reason unavailable)

the same account is OK immediately after.

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Philile-TT
Support Team
Staff
Private Message

on ‎04-11-2025 07:15 AM

Message 42 of 44

@gmlack are you using webmail? 

Phili
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gmlack
Super Duper Contributor
Private Message TalkTalk

on ‎04-11-2025 12:35 AM

Message 43 of 44

More details, and it's getting stranger.

 

That email , which was sent to 7 addressees, has not been sent to any of them.

 

But if I send an email to 6 of those (same) addressees then TalkTalk accepts it for 5 of them immediately, rejects the 6th but accepts that 6th one on its second attempt a few minutes later.

 

I can also send an individual email to the 7th addressee with no problem.

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