Outlook 2003 Reject header forgery

[Randy]

One of our users is getting rejections for header forgery when he
replies or forwards a message from one of our catch-all email
accounts. The message quoted below was generated when the user
received a message to (e-mail address removed) from (e-mail address removed) and
replied to it using Outlook 2003. The ISP that runs the POP server
says its an Outlook problem. The user has multiple email accounts
setup within outlook. What should I look for to fix it?

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

Subject: RE: Test message

Sent: 10/31/2007 11:22 AM

The following recipient(s) could not be reached:

'Joe User' on 10/31/2007 11:22 AM

554 5.7.1 Header forgery attempt - rejected

 

[Brian Tillman]

One of our users is getting rejections for header forgery when he
replies or forwards a message from one of our catch-all email
accounts. The message quoted below was generated when the user
received a message to (e-mail address removed) from (e-mail address removed) and
replied to it using Outlook 2003.

That's a recipient server-side error. Contact your recipient and inform
them they'll need to adjust their junk filter if they wish to receive your
mail.

There may be a way to address it on the client end, but you'll have to state
what kind of account you're using and how you select the alternate address.