Thought you'd like to know. To quote http://projects.puremagic.com/greylisting/whitepaper.html?view=markup:
"One issue is that some MTA software (Exim for example) attempts to limit the problem of forged sender addresses by attempting to verify that the claimed sender of an email is a valid address by doing an SMTP callback before accepting mail. Since it is desired to minimize the traffic when a mail may be rejected temporarily, the best course of action would be to issue a tempfail after the RCPT command. However, in the case of a SMTP callback, doing so at that point may cause our outgoing mail to be delayed unnecessarily." I don't think exim does that by default (anymore?). It could get you blacklisted someone wrote here recently. Regards, Jeroen -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
