AOL postmaster rejections.
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,
On 11/19/15 6:08 AM, John Peach wrote:
Has anyone else with relatively large volumes of email seen a huge spike in rejections from AOL recently?
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. -- Robert L Mathews, Tiger Technologies, http://www.tigertech.net/
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,
On Thu, 19 Nov 2015 13:30:17 -0600 Blake Hudson <blake@ispn.net> wrote:
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.
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.
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,
participants (3)
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Blake Hudson -
John Peach -
Robert L Mathews