Re: [exim] BATV and SRS interaction

On 08/01/16 11:37, Robert Blayzor wrote:
> Or am I missing something and that BATV and SRS re-writes co-exist in
> harmony? It certainly does not seem possible?

They work together as the SRS system will rewrite the bounced address
back to the BATV address and bounce that back to the original. SRS
chains are possible, but may need DB storage of wrapped addresses if
they are too long, or just for convenience.

A = Origin server
B = Forwarding server
.. (more fwd servers)
C = Final server

- A signs address with BATV
prvs=NNNNNNNNNK=peter@???
- B receives email, wraps address with SRS
SRS0=HHH=TT=example.com=prvs=NNNNNNNNNK=peter@???
(or if this is a multi-step SRS1, ..)
- C rejects or bounces to SRS address (technical difference ignored)
- B unwraps SRS to BATV
- bounce sent back to A