Replica: Add message token for bounces #19
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We add the per-message individual message token to the SMTP FROM, which is mainly used in the return path (i.e. for bounce messages). By adding the token to the mail address, we now are able to assign incoming bounces not only by the x-postal-msgId header, but also by their individual message tag / address.
Beside the search based on X-Postal-MsgID header, we also can assign incoming
bounces by their individually generated mail address (with the same tag as
in the X-Postal-MsgID). This is configurable, with the default disabled to
have it backwards compatible.
From a performance perspective, searching by this address based approach
always is faster than scanning the full mail for the presence of the header,
so we could also consider to make this feature enabled by default.
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Questa PR replica la PR originale: postalserver#3036
Autore originale: @schueffi
Branch originale:
add_message_token_for_bouncesRepository originale: schueffi/postal
Similar to pull request 2855 ( postalserver#2855 ), the message token will be inserted into MAIL FROM (i.e. for the return path for bounces).
In addition, there is a new configuration option (default disable the new feature), to look for this newly generated message tag when a bounce message comes in. If no tag is found, or the new lookup feature is disabled, then the old (backwards compatible) lookup for the X-Postal-MsgID header will be utilized to search for the corresponding referenced mail.
Using an individual mail address is way more stable than inserting a header into outgoing mails, and relaying on the existence of this header in incoming bounce messages. A lot of "real world" MTAs out there strip additional headers or compose new bounce mails not including the X-Postal-MsgID header. All those incoming bounces can be easily assigned to their corresponding outgoing mails by their individual message tag as part of the bounce mail address.