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tools-mail exim queue has lot of frozen messages
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Description

Spotted while browsing https://shinken.wmflabs.org/problems , it seems exim on tools-mail has a too many blocked messages in its queue.

The statsd metric tools.tools-mail.exim.queue.length over 24 hours:

tools-mail_exim-queue-length.png (442×643 px, 16 KB)

https://graphite-labs.wikimedia.org/render/?width=643&height=442&_salt=1537174758.258&target=tools.tools-mail.exim.queue.length&yMin=0

That matches the frozen metric, so probably messages that cannot be delivered.

And for tools.tools-mail.exim.queue.size over a week (I have no clue what the size is, maybe that is bytes):

tools-mail_exim_queue_size.png (442×643 px, 22 KB)

https://graphite-labs.wikimedia.org/render/?width=643&height=442&_salt=1537174998.797&yMin=0&target=tools.tools-mail.exim.queue.size&from=-1weeks

Event Timeline

Most emails are from qq.com, spam.

aborrero@tools-mail:~$ sudo exiqgrep -ic qq.com
1187 matches out of 1187 messages

aborrero@tools-mail:~$ sudo exiqgrep -c
1188 matches out of 1188 messages

I will delete them all.

Mentioned in SAL (#wikimedia-cloud) [2018-09-17T09:13:06Z] <arturo> T204481 aborrero@tools-mail:~$ sudo exiqgrep -i | xargs sudo exim -Mrm

aborrero claimed this task.

This is not the first time this happens. So perhaps we can think on having some long term solution to this.

Thanks for reporting.