[cobalt-users] RE: SMTP Error

["Dan Kriwitsky" <webhosting@xxxxxxxxx>]

{rearranged}
> > > When some users email to my domain they received the following error:
> > >
> > > "Connected to xx.xx.xx.xx but sender was rejected.
> > > Remote host said: 451 4.1.8 <name@xxxxxxxxxx>... Domain of sender
> > > address name@xxxxxxxxxx does not resolve"
> > >
> > > xx.xx.xx.xx reflects the correct IP address of the domain
> receiving the
> > > email.
> > > name@xxxxxxxxxx is a valid user account at a valid domain.
> >If you would post the real domain, it would help. It might be
> valid, but a
> >check of the DNS for that domain may find errors.
> Thanks for responding.  The domain sending the email was cosinus.com.  In
> test messages from this domain it is only on two RAQ4's that I can't
> receive email.  I can on a different ISP account.
>

It might be because there doesn't appear to be an A record in the DNS for
cosinus.com that your server is having trouble getting the domain name
cosinus.com to resolve. Maybe it's a problem with whatever DNS your server
is using to lookup the domain.
--
Dan Kriwitsky