On Thu, 18 Jun 2020 at 09:46, David Hartley <da...@sharproad.uk> wrote: > > I am running Postfix on a Synology NAS using DSM 6.2 > > In general I can receive emails, however I cannot receive emails > from<name>@ btinternet.com. > > An example of the sender's failure report is: > > Reporting-MTA: dns; sa-prd-fep-040.btmx-prd.synchronoss.net > Arrival-Date: Wed, 27 May 2020 18:31:52 +0100 > Received-From-MTA: dns; sa-prd-rgout-001.btmx-prd.synchronoss.net > (10.2.38.4) > > Final-Recipient: RFC822; <a...@xxxxxxx.uk> > Action: failed > Status: 4.4.7 > Remote-MTA: dns; xxxxxxx.uk > Diagnostic-Code: smtp; 250 2.1.5 Ok > > The Postfix log sees the BT mail server connect, but does not receive > any data: > > 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 is a problem at my end, or a problem at btinternet.com?
All incoming emails from BT (mailomta[0-9]+-sa\.btinternet\.com) have been received by our mailservers ok, the most recent was yesterday See the accepted answer at https://serverfault.com/questions/295409/how-to-solve-error-550-4-4-7 I suspect some firewalling action either on your mailserver or on an intermediate router.
