Author: Daniel Tiefnig Date: To: exim-users Subject: Re: [exim] Extremely Simple(?) greylisting with exim?
Andrew Johnson wrote: >>> Does it make sense to deliver to the 2nd MX if we know the 1st MX
>>> does not accept mail for the address? [...] > Also, take this scenario, what if the company hosts both MX's, they
> put a second there incase the first server drops dead, [...]
In that case we'd get an error for the *host*, which would cause exim to
just "ignore" the primary MX after some time and deliver to the
secondary immediately.
The problem I saw had to do with transient errors for the recipient
*e-mail address*. Exim does turn them into permanent errors if they
persist long enough, and I guess there is just no distinction between
real permanent errors and these long-lasting transient ones. At least
that would clearly explain exims behaviour, if it thinks it has got a
permanent error from the remote mailer.
