Hello Angus, I usually do it according to fail code 5.x.x or 4.x.x for 4.x.x I retry later, for 5.x.x I pout them appart to check manually why they have been rejected.
regards. >> Also if a MX refuse you because of some blacklist then remove >> thoses mails from the queue and send you a mail alert so you can >> investigate why destination refused your mail. ARMSL> It's important not to fail an email on a first refusal, due to the wide ARMSL> usage of 'greylisting' where the SMTP server rejects the first email ARMSL> attempt and then allows a second attempt, typically 10 to 15 minutes ARMSL> later. Sometimes the response mentions greylisting, but some SMTP ARMSL> servers don't even do that. ARMSL> MAIL FROM: <nursery...@englishmotorsports.com> ARMSL> 250 OK <nursery...@englishmotorsports.com> Sender ok ARMSL> RCPT TO: <i...@magsys.co.uk> ARMSL> 451 Greylisted, please try again in 600 seconds ARMSL> Once an email has been sent successfully, the server adds the sender to ARMSL> an internal list so future email is not delayed. ARMSL> Greylisting is very successful in stopping spam, at least for the moment, ARMSL> it stops 500 to 1,000 spams a day here. ARMSL> However have a couple of Delphi applications that currently sent email ARMSL> without using a queue or a 15 minute delay, which really need updating to ARMSL> cope with greylisting. ARMSL> Angus ARMSL> -- ARMSL> To unsubscribe or change your settings for TWSocket mailing list ARMSL> please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket ARMSL> Visit our website at http://www.overbyte.be -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be