Hello,
I'm not sure if I managed to fool myself. I was thinking about
greylisting as reverse rate limiting - the sender has to meet some
minimum sending rate to get the messages through.
As the 1st rule in my RCPT acl:
defer !ratelimit = 0.9/24h/per_conn/$sender_address=$local_part@$domain
I keyed the grey list entries on the senders and the local address
because I think it is the only constant part I'll see on a retry. The
24 hours are there to give a chance to mails coming from SAP.com, they
mostly try only once per 12 hours…
Comments?
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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