My log says
Mar 18 01:10:50 ubinas courieresmtpd: 
error,relay=::ffff:82.162.77.50,from=<[EMAIL PROTECTED]>,to=<[EMAIL 
PROTECTED]>: 511 http://www.spamhaus.org/query/bl?ip=82.162.77.50

The user [EMAIL PROTECTED] does not exist, so if this mail
hadn't been rejected with a 511, it would still have been rejected
with a 550.

Suggestion and RFE: first check the validity of the destination
address, only then check the RBLs. This order would not increase
the workload of the courier server, but it would decrease traffic
and the load on the RBL servers.

Z


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