https://bugs.exim.org/show_bug.cgi?id=1686
Bug ID: 1686
Summary: DSNs should give the sending IP used
Product: Exim
Version: 4.86
Hardware: All
OS: All
Status: NEW
Severity: wishlist
Priority: medium
Component: Delivery in general
Assignee: nigel@???
Reporter: jgh146exb@???
CC: exim-dev@???
To aid matching up a bounce reported from outside with one's own logs
an item of useful information would be the source IP. We should add this
to Exim's fail DSN in the hope that other MTAs do likewise.
Currently there is no standard DSN field, per RFC 3464. We could use an
extension field of experimental class, "X-Sending-MTA-interface" for now; a
proper assignment would require an RFC.
Assuming the field was similar in form to the Remote-MTA field it would have
'mta-name-type ";" arg' content; the only current mta-name-type
( per
https://www.iana.org/assignments/dsn-types/dsn-types.xhtml )
is "dns" and gives a name. I'd prefer an IP address, and would for now use an
experimental mta-name-type of "X-ip". Again, this would need an RFC for a
proper
assignment.
It would be nice to also have the remote MTA's view of our IP, in case of NAT
or proxying. Exim includes this in the default response to HELO/EHLO but we
can't rely on that.
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