"MrDk" <MrDk@discussions.microsoft.com> wrote in message
news:E42ED105-F023-44AA-84AE-B4C7957F1946@microsoft.com...
> Hi, I've got a problem sending mails to domains hosted by some ISP's. The
> mail cannot be delivered and the error message is something like this
> (SMARTHOST is our ISP smtp relay , RECIPIENT is recipient (doh), DOMAIN is
> recipients domain and LOCALDOMAIN is the Exchangeservers local domain):
>
> **** snip ****
>
> This is the Postfix program at host SMARTHOST.
>
> I'm sorry to have to inform you that your message could not be be
> delivered
> to one or more recipients. It's attached below.
>
> For further assistance, please send mail to <postmaster>
>
> If you do so, please include this problem report. You can delete your own
> text from the attached returned message.
>
> The Postfix program
>
> <RECIPIENT@DOMAIN>: host mailgw1.tiscali.dk[212.54.64.159] said: 553
> <SENDER@LOCALDOMAIN> unable to verify address (in reply to MAIL FROM
> command)
>
> **** snip ****
>
> The DNS is correctly configured, also there is a reverse lookup zone for
> the
> domain. This problem only occurs while sending from the Exchange 2003
> server,
> sending from Exchange 2000 is no problem, and various Linux based MTA's
> has
> no problems.
>
> any suggestions?

"Peter Karsai" wrote:

> Hello,
>
> Postfix can do "sender callout verifications", which means that if someone
> tries to send email in the name of john@example.org to a Postfix server, it
> connects back to the MX of example.org and initiates mail sending to
> john@example.org. If it fails, Postfix assumes that the sender was invalid.
>
> Most likely the problem is that the sender is in format john@LOCALDOMAIN,
> from which the "LOCALDOMAIN" zone cannot be resolved by the Postfix MTA.
>
> Peter
>
> "MrDk" <MrDk@discussions.microsoft.com> wrote in message
> news:E42ED105-F023-44AA-84AE-B4C7957F1946@microsoft.com...
> > Hi, I've got a problem sending mails to domains hosted by some ISP's. The
> > mail cannot be delivered and the error message is something like this
> > (SMARTHOST is our ISP smtp relay , RECIPIENT is recipient (doh), DOMAIN is
> > recipients domain and LOCALDOMAIN is the Exchangeservers local domain):
> >
> > **** snip ****
> >
> > This is the Postfix program at host SMARTHOST.
> >
> > I'm sorry to have to inform you that your message could not be be
> > delivered
> > to one or more recipients. It's attached below.
> >
> > For further assistance, please send mail to <postmaster>
> >
> > If you do so, please include this problem report. You can delete your own
> > text from the attached returned message.
> >
> > The Postfix program
> >
> > <RECIPIENT@DOMAIN>: host mailgw1.tiscali.dk[212.54.64.159] said: 553
> > <SENDER@LOCALDOMAIN> unable to verify address (in reply to MAIL FROM
> > command)
> >
> > **** snip ****
> >
> > The DNS is correctly configured, also there is a reverse lookup zone for
> > the
> > domain. This problem only occurs while sending from the Exchange 2003
> > server,
> > sending from Exchange 2000 is no problem, and various Linux based MTA's
> > has
> > no problems.
> >
> > any suggestions?
>
>