AOL postmaster rejections.

[blake at ispn.net (Blake Hudson)]

John Peach wrote on 11/19/2015 8:08 AM:
> Has anyone else with relatively large volumes of email seen a huge
> spike in rejections from AOL recently?
Yes.

> There is no obvious reason why they are being rejected as it is a
> generic message:
>
> Nov 18 12:10:39 pp-serve02 sendmail[1391]: tAIHAcPT001383:
> mailin-04.mx.aol.com.: SMTP DATA-2 protocol error: 521 5.2.1 :  AOL
> will not accept delivery of this message.
>
> Looking back through my logs, I can see we've always had a few, but we
> are now receiving a lot of complaints from users (physicians who cannot
> email their patients) and I see this, starting on Monday:
>
> syslog-2015-11-16
> 588
> syslog-2015-11-17
> 1668
> syslog-2015-11-18
> 1937
>
> and I already have 55 for today.
Same; started this week. Only appears to affect one of our servers.

Rejected messages by date:
2015-11-15
9
2015-11-15
4
2015-11-16
400
2015-11-17
710
2015-11-18
683

>
> We have a whitelist / feedback loop set up with AOL, our IPs show clean
> with them and our DNS / reverse DNS has not changed and resolves
> properly.
Same here

>
> We did raise a ticket with them, but it seems to have gone to the
> usual /dev/null.
Same here. I'm recommending AOL customers contact AOL for support.

>
> To reply off-list, please remove the VERP -nanog from my email address,