On 17/03/2008, Jeroen van Aart <kroshka@???> wrote:
> Thought you'd like to know.
>
> To quote
> http://projects.puremagic.com/greylisting/whitepaper.html?view=markup:
A source that's 5 years old...
>
> "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, 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 necessarily."
>
> I don't think exim does that by default (anymore?). It could get you
> blacklisted someone wrote here recently.
Exim never has done callouts by default - which is confirmed by the
Exim documentation referenced in the original article (Exim v 4.10).
Not much to see here......
Peter
--
Peter Bowyer
Email: peter@???
