At 13:52 +0200 2003/09/28, Robert wrote: >I use in my Exim 4.23 the option:
>
>require verify = sender/callout
>
>This works fine with remote hosts, which send and receive SMTP
>connection for the user that is verified.
>But sometimes the SMTP connection comes from a host, which only sends
>emails via SMTP but not receives any.
>In such case the callout does not work. Is it possible to configure
>Exim to make callout verification using the MX value instead of the
>host IP/name the SMTP connection comes from?
but this is what exim does as it must! If callout sometimes fails, is
with servers that do not accept null senders or servers that refuse
mail from yours on other grounds (both are badly configured).