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Don't send error/exception mail to unverified addresses

Authored by epriestley on Feb 7 2018, 1:18 PM.



Depends on D19017. Fixes T12491. Ref T13053. After SES threw us in the dungeon for sending mail to a spamtrap we changed outbound mail rules to stop sending to unverified addresses, except a small amount of registration mail which we can't avoid.

However, we'll still reply to random inbound messages with a helpful error, even if the sender is unverified.

Instead, only send exception mail back if we know who the sender is.

Test Plan

Processed inbound mail with scripts/mail/mail_handler.php. No more outbound mail for "bad address", etc. Still got outbound mail for "unknown command !quack".

Diff Detail

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