[exim] Another question about SRS

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Autor: Luca Bertoncello
Data:  
A: Exim-Users ML
Assumpte: [exim] Another question about SRS
Hi @all!

With the good help of Peter Bowyer, I configured my Exim to use SRS.
It works, thank a lot again, Peter! :)

Now I have a little question about HOW SRS works...

I see, if I have a forward, Exim rewrites the sender (return-path) in a
syntax as SRS0=XWYKL=IC=<domain_sender>=<localpart_sender>@<mydomain>

OK! I can see the original sender and the destination MTA can verify my SPF
information using "@<mydomain>". All right!

I read in http://www.openspf.org/SRS that SRS adds this has (in my case:
XWYKL=IC) to prevent open relays, and to limit the time this address lives.

I see in http://www.exim.org/eximwiki/SRS that it is possible to use a DB to
save this information, but I don't understood why...
I tryed, with ngrep, to trace what happens, hoping that the destination MTA
try to ask my MTA if the address is valid. It does not seems to do that.
And MY Exim seems not to save this hash, too!

Can someone explain me what exactly this hash is good for? I didn't found an
exhaustive answer in the docs...

Thanks a lot!
--
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Luca Bertoncello
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