Zenon Panoussis writes:
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=82.162.77.50The 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.
Yes, it would increase the load on Courier. With most configurations, checking the validity of the recipient's address is relatively expensive. A DNS lookup isn't. The same sender is likely sending multiple spams, after the first lookup the DNS record gets cached, and subsequent delivery attempts incur very little overhead.
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