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Problems sending email with Outlook 2007

Hi,

I am trying to send emails using outlook 2007 and i'm receiving the following errors. It seems to be a desktop issue seeing that i can send emails via my BB and other applications but not using outlook.

Your message did not reach some or all of the intended recipients.

Subject: RE: dev.athletixnation.com
Sent: 8/19/2007 10:01 PM

The following recipient(s) could not be reached:

'Bobby Williams' on 8/19/2007 10:01 PM
554 5.7.1 <bobby.williams@iastar.net>: Relay access denied

Any assistance would be appreciated.

Thanks

Make sure that you set My server requires authentication to ON in Outlook.

Server requires authentication is set

My server requires authentication is already set.

Any other thoughts?

Thanks
dr

What's in /etc/postfix/main.cf (please strip out the comments)?
What's the output of

Code:

telnet localhost 25

and then

Code:

ehlo localhost

?

Any errors in your mail log?