Has anyone else with relatively large volumes of email seen a huge
spike in rejections from AOL recently?
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.
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.
We did raise a ticket with them, but it seems to have gone to the
usual /dev/null.
To reply off-list, please remove the VERP -nanog from my email address,
We also saw a large increase in this "AOL will not accept delivery of
this message" problem earlier this week, despite also having "good
reputation" on the affected IP addresses, no changes in what we send, no
DNS changes, etc.
It happened on about half our outbound mail server IP addresses, but not
on the others. We temporarily switched to using only the "good" IP
addresses to send to AOL, and they happily accept the same messages.
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.
> 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.
Now that is interesting; I hadn't though to check that, but it is
affecting 3 out of our 4 and they are all in the same subnet.