resolving email addresses

[Derek Winkler]

> Hello,
>
> I tried to test a new MailScanner/Sendmail setup we have, but from the
> outside a telnet session to the mail server will give an
> error of, "Domain
> of sender address "joesomebody at realdomain.com" doesn't
> resolve. However, I
> can ping the domain from the server.
>
> Any clues on how to fix this?

You may have a feature of sendmail turned on which doesn't accept email from
addresses which don't have MX records.

Can the server find MX records for the domain?

>
> Thank you in advance.
>
> James
>