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Add alertmanager@ email user/alias or equivalent
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Description

While testing email from AM we're using an non-existent envelope-from now:

2020-11-30 13:07:43 1kjiu7-0005N8-J1 <= alertmanager@wikimedia.org H=(localhost) [::1]:55726 I=[::1]:25 P=esmtp S=10584 id=1606741663590089237.16654494479565861601@alert1001
2020-11-30 13:07:43 1kjiu7-0005N8-J1 ** ayounsi@wikimedia.org R=smart_route T=remote_smtp H=mx1001.wikimedia.org [2620:0:861:3:208:80:154:76] I=[2620:0:861:3:208:80:154:88]: SMTP error from remote mail server after RCPT TO:<ayounsi@wikimedia.org>: 550-Verification failed for <alertmanager@wikimedia.org>\n550-Address alertmanager@wikimedia.org does not exist\n550 Sender verify failed
2020-11-30 13:07:43 1kjiu7-0005Nj-LM <= <> R=1kjiu7-0005N8-J1 U=Debian-exim P=local S=12310
2020-11-30 13:07:43 1kjiu7-0005N8-J1 Completed
2020-11-30 13:07:43 1kjiu7-0005Nj-LM ** alertmanager@wikimedia.org R=smart_route T=remote_smtp H=mx1001.wikimedia.org[2620:0:861:3:208:80:154:76] I=[2620:0:861:3:208:80:154:88]: SMTP error from remote mail server after RCPT TO:<alertmanager@wikimedia.org>: 550 Address alertmanager@wikimedia.org does not exist                                                                                                                 2020-11-30 13:07:43 1kjiu7-0005Nj-LM alertmanager@wikimedia.org: error ignored
2020-11-30 13:07:43 1kjiu7-0005Nj-LM Completed

Event Timeline

Change 644517 had a related patch set uploaded (by Filippo Giunchedi; owner: Filippo Giunchedi):
[operations/puppet@production] alertmanager: use o11y address as from

https://gerrit.wikimedia.org/r/644517

Change 644517 merged by Filippo Giunchedi:
[operations/puppet@production] alertmanager: use o11y address as from

https://gerrit.wikimedia.org/r/644517

fgiunchedi claimed this task.

Changing the envelope from to the o11y team address proved effective, with the added bonus that "reply to" will work as is and we can receive feedback.