Jeroen van Aart wrote: > 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 >
AFAIK, the 'generic' Exim hasn't done that 'by default' in donkey's years - if it *ever* did. What it did/does do is a mx *lookup* (against the nearest aware DNS) to insure it at least 'seems to be able' to route a bounce (or ordinary reply...), and even that only when configured to do so. CAVEAT: I've never paid a lot of attention to the default config, so could well be wrong. Otherwise, yes - it looks as if the citation is in error, and shoudl instead have said that Exim '.. may sometimes be configured to do an smtp callout..' Bill -- ## 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/
