Given that so many of the big names seem to be completely wedded to the 
abomination that is SPF and all the valid things it breaks, seems like I'm 
going to have to start doing SRS.
I've installed postsrsd from https://github.com/roehling/postsrsd but ...
Sender quotas seem OK - based on SASL auth id. But and greylisting is hosed. 
AIUI postsrsd rewrites the sender address before policyd gets to process the 
message - so greylisting effectively gets "reset" every day (when the SRS 
timestamp changes). Postsrsd integrates via these Postfix incantations :
sender_canonical_maps = tcp:localhost:10001
sender_canonical_classes = envelope_sender
recipient_canonical_maps = tcp:localhost:10002
recipient_canonical_classes= envelope_recipient,header_recipient

I find that greylisting tends to be pretty invisible for a lot of email - 
simply because a lot of it is between people who have communicated before and 
it's whitelisted. But if it's "reset" every day then it's going to be much more 
intrusive.

Any thoughts on ways round this ?


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