[Evergreen-general] Hold emails appear to not be working

[JonGeorg SageLibrary]

Greetings. I have two libraries that have noticed that hold emails have not
been going out the last couple days. One of the libraries was able to send
me specific patron info and I was able to query the db and verify that no
hold emails went out for those patrons. I do see other emails going out
from the system via the mail.log on the server, so the mail server is up
and working.

I did have an issue where the log server ran out of space and I had to
reboot it after clearing space, however I have been able to verify that
hold emails went out after that, so that should not be an issue, but it is
the only unusual recent event for our system that I'm aware of. Email
receipts are working as expected, included among the patrons I know did not
receive hold email notifications.

I've checked syslog for CRON jobs, for such things as hold_targeter.pl,
action_trigger_runner.pl, thaw_expired_frozen_holds.srfsh, and I don't see
any errors and all CRON jobs appear to be running and finishing
successfully.

I've also checked the mail.log file and do not see any entries for these
patrons regarding their holds which makes sense as there is no entry in the
db, but I do see email receipts. I do see a ton of 'Network is unreachable'
errors related to gmail and other providers, but that is a separate issue
and likely a reason to consider a 3rd party application to handle
notifications.

Is it possible that there is a backlog of stuck hold emails like what
happens when the reporter gets stuck? Is there a way to force the hold
email function to stop and restart, perhaps in the database itself? I've
restarted all services on all servers [minus the db servers] without
resolution.

Thanks
-Jon
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