Re: Exch 2003 #5.5.0 smtp;553 + unable to verify address

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Hello,

Postfix can do "sender callout verifications", which means that if someone
tries to send email in the name of john@xxxxxxxxxxx to a Postfix server, it
connects back to the MX of example.org and initiates mail sending to
john@xxxxxxxxxxxx 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@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:E42ED105-F023-44AA-84AE-B4C7957F1946@xxxxxxxxxxxxxxxx
> 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?


.

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