[...]
> I have an Exim 4.05 running on a Red Hat box. It's all fine except for
> some incoming mails. We're getting trouble to receive some mails from a
> particular domain.
What happens? What do the logs say?
> When I try to "telnet <their domain> 25" I got a
> reply looks like this: 220
> ******************************************************** Is this the
> cause for that incoming problem ?
I think no. What you see is afaik from a cisco, the feature is named
"mailguard".
