Avatar of kkiedrowski
kkiedrowskiFlag for United States of America asked on

Returned Email

Windows 2000 server running exchange 5.5
Clients running windows xp pro and outlook 2000

I have a few users who keep getting undeliverable email messages. The message says that the address that they are sending it to is not a valid email address. The problem lies in the fact that these users did not send the original email and I am puzzled as to what to do to verify that we are not hacked. I have relay disabled.
Where else to look?

Avatar of undefined
Last Comment

8/22/2022 - Mon


Could it be a mass-mailing worm/virus problem? Sounds like it. What's your antivirus setup like, and have you got exchange aware av?

Deb :))

Scan the offending clients, and update or install an exchange-aware av solution and scan the mailboxes etc, listed partners here:


We have antivirus software on the server. infact we have two layers.
We have it filters and scanned before it comes into our server and then we use a local scan on all incoming/outgoing email.
However, I am not 100% sure about the client machine.
I will push the virus software to them and see if that fixes it.
Experts Exchange is like having an extremely knowledgeable team sitting and waiting for your call. Couldn't do my job half as well as I do without it!
James Murphy

I have yet to find a virus on this machine
it appears to be ahppenign on others as well

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
See how we're fighting big data
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question