Re: [exim] Sender verification failing sometimes

On 15 Jun 2011, at 16:32, W B Hacker wrote:

>
> Or time-out a sender_verify callout..

I have, very rarely, seen an issue where the callout target delayed a response for longer than the original sender's smtp timeout. Not in the past few years, though.

However, that would probably mean that a site would, theoretically, have trouble sending mail to itself. Either its tarpitting policy is unfeasibly harsh, or its persistence in the SMTP phase is very optimistically small.

--
Ian Eiloart
Postmaster, University of Sussex
+44 (0) 1273 87-3148