Cannot send to this ONE particular domain.

error message reads:-

You do not have permission to send to this recipient.
For assistance, contact your system administrator.
<mail #5.7.1 smtp;501 5.7.1 Your HELO
argument, mail, is not a fully-qualified hostname or IP
address.  Please contact your system administrator and
ask them to configure your mail server to issue a HELO
command with a valid argument.>

I REPEAT, THERE IS ONLY DOMAIN WE HAVE PROBLEMS SENDING
TO-

Any idea's anyone???? This has been driving me barmy for
months!

[ Post a follow-up to this message ]

Certain SendMail implementations will do domain/IP lookup on the sending
party based on the HELO/EHLO argument (due to variety of reasons), and if it
fails refuse mail transaction with such a party.  Make sure the argument
supplied to HELO/EHLO is actually a valid host/FQDN or IP with corresponding
DNS structure.

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"Big Al" <anonymous@discussions.microsoft.com> wrote in message
 news:10a3601c3f4a8$ba50dad0$a301280a@phx
.gbl...
> Cannot send to this ONE particular domain.
>
> error message reads:-
>
>   You do not have permission to send to this recipient.
> For assistance, contact your system administrator.
>             <mail #5.7.1 smtp;501 5.7.1 Your HELO
> argument, mail, is not a fully-qualified hostname or IP
> address.  Please contact your system administrator and
> ask them to configure your mail server to issue a HELO
> command with a valid argument.>
>
> I REPEAT, THERE IS ONLY DOMAIN WE HAVE PROBLEMS SENDING
> TO-
>
> Any idea's anyone???? This has been driving me barmy for
> months!
>
>

[ Post a follow-up to this message ]