'550 5.7.1'...'we do not relay' in Outlook 2003 w/out Exchange

[Kydd]

We use the Merak Mail Server w/out SMTP authentication enabled and 1 of our
XP Pro Outlook 2003 users occasionally gets emails rejected by Outlook. The
mail never hits the mail server, i.e., no logs. Note the From address below.
This does not happen with every email. I set mails to be sent using plain
text and that seemed to work for a little while but the problem now occurs
randomly even in plain text mails. What else could be causing the below
rejection message?

From: System Administrator
Sent: Thursday, June 15, 2006 3:34 PM
To: '(e-mail address removed)'
Subject: Undeliverable: letter

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

Subject: FW: letter
Sent: 6/15/2006 3:34 PM

The following recipient(s) could not be reached:

'(e-mail address removed)' on 6/15/2006 3:34 PM
550 5.7.1 <[email protected]>... we do not relay
<[email protected]>

 

[Barbarah]

Check to see if your user has more than one email account set up.

HTH<
Barbarah

 

[Kydd]

Yeah that was the 1st thing I checked. I got a reply from Merak support
saying that SMTP auth should now be turned on in Outlook based on changes
made to the latest version of their software (8.5.0-1). We'll see if that
does the trick.