Add X-Auto-Response-Suppress header to outgoing messages #6492
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This is a header used to suggest mail servers not to respond to a message with an auto-responder:
https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxcmail/ced68690-498a-4567-9d14-5c01f974d8b1
This header is also used by github and gitlab in outgoing messages.
Fixes #6484