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mass Yahoo / AOL bounces mailman
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Description

About 9 hours ago I got a massive number of disabled subscriptions (40-50) of aol.com addresses because of excessive bounces ~10h ago. Bounce notifications are mostly of the type:

SMTP error from remote mail server after MAIL FROM:<wikilovesmonuments-bounces@lists.wikimedia.org> SIZE=16180:

host mx-aol.mail.gm0.yahoodns.net [98.137.157.43]:
421 4.7.0 [TSS04] Messages from 208.80.154.21 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html:
retry timeout exceeded

Let me know if I can provide more detail. Mailing list in question is wikilovesmonuments but sounds like a more generic issue is at the core.

Event Timeline

Restricted Application added a project: Operations. · View Herald TranscriptMon, Sep 9, 11:43 PM
Restricted Application added a subscriber: Aklapper. · View Herald Transcript
Effeietsanders renamed this task from mass AOL bounces on mailman to mass AOL bounces mailman.Mon, Sep 9, 11:44 PM
Effeietsanders updated the task description. (Show Details)
Effeietsanders updated the task description. (Show Details)

Always helpful when Yahoo does not list that error code on Yahoo's page that is supposed to list their error codes...

jbond triaged this task as Normal priority.Tue, Sep 10, 10:10 AM
jbond added a project: Mail.
jbond added a subscriber: jbond.
herron added a subscriber: herron.Tue, Sep 10, 1:44 PM

These bounces are happening occasionally now.

Platonides added a subscriber: Platonides.EditedSun, Sep 22, 8:11 PM

Yesterday, we had the same issue on biblio-es-l with all subscribers using a yahoo.es email address being automatically disabled delivery (funnily, it was not the case for those with a yahoo.com one), as the max retry timeout for emails from an email from Tuesday was reached.

Error received was the same:

 SMTP error from remote mail server after MAIL FROM:<XXXXXX-l-bounces@lists.wikimedia.org> SIZE=15609:
host mx-eu.mail.am0.yahoodns.net [188.125.72.73]:
421 4.7.0 [TSS04] Messages from 208.80.154.21 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html:
retry timeout exceeded

(208.80.154.21 is lists.wikimedia.org)

https://help.yahoo.com/kb/postmaster/SLN3434.html mentions:

  • The error is temporary. We encourage you to retry sending emails 4 hours after encountering the error.
  • If you're an administrator of message content and mailing policy and you've deployed significant changes or you've received this error for more than 48 hours, we ask that you review outgoing messages for objectionable content or practices.

IMHO this is likely a false positive on Yahoo! side considering that the emails from list are spam. Most likely, that will be caused by blocked/discarded emails sent to mailing list owners, since mailman will take care of everything on https://help.yahoo.com/kb/postmaster/recommended-guidelines-bulk-mail-senders-postmasters-sln3435.html However, it will damage the service for yahoo subscribers. I suppose there is a FBL with yahoo, that could be checked, too?

Platonides renamed this task from mass AOL bounces mailman to mass Yahoo / AOL bounces mailman.Sun, Sep 22, 8:11 PM

See T22507 for the same issue in 2009

Similarly, on Wednesday ...@yahoo.com subscriptions were disabled for wikitech-l due to this same issue, bouncing https://lists.wikimedia.org/pipermail/wikitech-l/2019-September/092531.html, a legitimate email which seems perfectly innocuous.