On 18 Jun 2020, at 02:45, David Hartley <da...@sharproad.uk> wrote:
> 2020-06-09T12:04:00+01:00 <myserver> postfix/smtpd[7356]: connect from
> mailomta12-sa.btinternet.com[213.120.69.18]
> 2020-06-09T12:04:01+01:00 <myserver> postfix/smtpd[7356]: Anonymous TLS
> connection established from mailomta12-sa.btinternet.com[213.120.69.18]:
> TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
> 2020-06-09T12:04:01+01:00 <myserver> postfix/smtpd[7356]: A33018C5A8C:
> client=mailomta12-sa.btinternet.com[213.120.69.18]
>
> 2020-06-09T12:09:01+01:00 <myserver> postfix/smtpd[7356]: timeout after DATA
> (0 bytes) from mailomta12-sa.btinternet.com[213.120.69.18]
> 2020-06-09T12:09:02+01:00 <myserver> postfix/smtpd[7356]: disconnect from
> mailomta12-sa.btinternet.com[213.120.69.18] ehlo=2 starttls=1 mail=1 rcpt=1
> data=0/1 commands=5/6
>
> Can anyone suggest what the problem is here please?
Is that really all the log lines? There should be a PERMIT line in there that
will include something like this:
Jun 18 05:39:43 mail.covisp.net postfix/smtpd[77265] 49ng2k4wjlz2s14Y: permit:
RCPT from camomile.cloud9.net[168.100.1.3]: action=permit for Recipient
address=krem...@kreme.com ; from=<owner-postfix-us...@postfix.org>
to=<krem...@kreme.com> proto=ESMTP helo=<camomile.cloud9.net>
What is in the helo= field might be a clue, since it looks from the NDR that
the mail server is using a private IP address, but without more logging it is
hard to be sure. It looks like what you have is a successful connection and the
the other side gives up five minutes later, for no reason at all, after sending
absolutely no data.
Either bt is expecting something your Mailserver is not doing, or there are
other log lines, or their server is ver broken (and the latter seems highly
unlikely).
You are receiving emails from other senders, I take it?
(Obfuscating your mail server makes checking things like your DNS records or
what your server actually is sending impossible, we cannot assume that
sharproad.uk is the domain in question.) If that is the right server, it's
definitely weird (it doesn;'t accept ehlo, for one). What version of postfix
are you running?
Connected to sharproad.uk.
Escape character is '^]'.
220 sharproad.uk ESMTP Postfix
ehlo mail.covisp.net
502 5.5.2 Error: command not recognized
helo mail.covisp.net
250 sharproad.uk
mail from:kr...@kreme.com
250 2.1.0 Ok
rcpt to:da...@sharproad.uk
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
this is a test
.
250 2.0.0 Ok: queued as 52A4F8C1A0A
quit
221 2.0.0 Bye
This is what I see on my own server:
Connected to mail.covisp.net.
Escape character is '^]'.
220-mail.covisp.net ESTMP -- Please wait
220 mail.covisp.net ESMTP Postfix 3.5.3
ehlo fake.com
250-mail.covisp.net
250-PIPELINING
250-SIZE 26214400
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 CHUNKING
mail from:b...@whitehouse.com
250 2.1.0 Ok
rcpt to:kr...@kreme.com
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
this is a test
.
250 2.0.0 Ok: queued as 49nh4035Qgz2s14Y
quit
221 2.0.0 Bye
There are some pretty obvious differences here, and the lack of SIZE could be
an issue. It is quite possible that btinternet is biting specifically for a
SIZE or some other 250 code that you are not sending.
Complete logs for the message and postconf -nf would help solve this
--
When a distinguished but elderly scientist states that something is
possible, he is almost certainly right. When he states that
something is impossible, he is probably wrong.
