resolving email addresses

[Julian Field]

At 19:56 23/03/2004, you wrote:
>Thanks Derek,
>
>How would I have the server find the MX records?
>
>
>This is the forth MailScanner I built and previous three didn't have that
>error. Interesting though. I do see the Feature setting, I think. Is this
>it?
>FEATURE(`relay_based_on_MX')dnl

 From what I remember, that feature is a *very* bad idea. Read
www.sendmail.org on the subject. I think it makes you relay any domain for
which you are an MX. So the spammers make you an MX for their domain, and
you start relaying their spam for them. Bet that's just what you want :-(


>Thanks again for your help.
>
>James
>
>
>-----Original Message-----
>From: Derek Winkler [mailto:dwinkler at ALGORITHMICS.COM]
>Sent: Tuesday, March 23, 2004 11:40 AM
>To: MAILSCANNER at JISCMAIL.AC.UK
>Subject: Re: resolving email addresses
>
>
> > 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
> >

--
Julian Field
www.MailScanner.info
Professional Support Services at www.MailScanner.biz
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