One users mail is adding in a extra domain name. Can you help?

A user is sending mail out with a return address that has an extra domain. Instead of ellen@abc.com it is sending ellen.abc@abc.com.

I have checked there ownership under user pregerences when they have there mail file open and it is correct. Ellen/ABC.

What would cause this?

Subject: One users mail is adding in a extra domain name. Can you help?

Frank, Did you ever determine the cause?

Subject: One users mail is adding in a extra domain name. Can you help?

Did you check the email address in her location doc(s) and in the person doc?

Subject: RE: One users mail is adding in a extra domain name. Can you help?

Yes. The email adderess looks just fine in both her location document and her person document in the main address book for the company.