Re: "550 5.7.1 Unable to relay" TO external domains

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You may receive this message either because you use POP3/SMTP mail client and it is not configured to authenticate with the server for outgoing e-mail or your firewall prevents Exchange from sending mail out.
If you use Outlook in "Exchange Server" mode (or OWA) you do not need to enable relaying in Exchange (your firewall needs to allow sending mail out).

mustafa wrote:
Hi together,
I have a big problem to send to any recipient which has an external domain (outside of Exhange organization).
I deployed Exchange 2003 + SP2 based on Windows 2003 AD. - Installation of Exchnage is a default installation.
- Default recipient policy exists.
- There is no restriction to send mails.
- Only SMTP VS1 is used to send mails.

The users on Exchange server cann send mails internally without any problem. BUT if they send any mail to an user who has an external domain address, they get the following error:
"550 5.7.1 Unable to relay for username@xxxxxxxxxxxxxxxxxx".

On the SMTP VS, the option "Allow all computers which successfully authenticate to relay, regardless of the list above" is enabled.

Please help!

Best Regards
Mustafa


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