Eduardo Gargiulo <[EMAIL PROTECTED]> wrote:
> On Tue, Sep 04, 2001 at 01:14:14PM -0600, Charles Cazabon wrote:
> > Eduardo Gargiulo <[EMAIL PROTECTED]> wrote:
> > >
> > > 2001-09-04 13:49:06.916287500 delivery 3894: deferral:
> > >
>Connected_to_216.244.192.136_but_sender_was_rejected./Remote_host_said:_451_4.1.8_<[EMAIL PROTECTED]>..._Sender_domain_must_resolve/
[...]
> >
> > Fix your DNS so it resolves properly.
>
> What to you mean with fix? What kind of lookup the SMTP server did?
> sun.mcolivia.com.ar is a low priority MX for mcolivia.com.ar. Is there
> any other record I have to conf on my dns?
The remote server failed some lookup and rejected the mail based on that
(it's a bad idea, but it's getting more common anyway -- yet another way
to reduce the reliability of the mail infrastructure to "fight spam").
If it was a temporary failure, or caused by a problem at the remote
site, there's nothing you can do.
If the lookup failed because you don't have matching forward and reverse
DNS, or don't have an MX record, or used a name in HELO that doesn't
resolve, or any of a hundred other fiddly DNS-related reasons, you can
tweak that. But there's no easy way to tell precisely what failed. The
message seems to imply it was the domain of the sender address, but I've
seen worse brokenness before.
Charles
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Charles Cazabon <[EMAIL PROTECTED]>
GPL'ed software available at: http://www.qcc.sk.ca/~charlesc/software/
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