Gordon Dickens wrote: > Hello,
>
> I have a question about how exim does sender verify callouts.
>
> Based on my testing, it appears that exim always uses the incoming host
> (or incoming IP address) for doing callouts. That is, it appears that
> exim always connects directly to the host that initiated the smtp
> session for doing the callout. Could someone either confirm or refute this?
>
> If that is the case then I have a second question: Is their a way to
> force exim to use the domain MX record for callouts instead of going
> directly to the incoming host for the callout?
>
Exim uses the MXes for sender callouts, the only difference with a
normal delivery is that it always use HELO for callouts, never EHLO.
