[exim] greylisting is inverse rate limiting

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Author: Heiko Schlittermann
Date:  
To: exim-users
Subject: [exim] greylisting is inverse rate limiting
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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