troubleshooting Question

Exchange System Undeliverable's Spam or Rogue server?

Avatar of Crucio666
Crucio666 asked on
ExchangeMicrosoft IIS Web ServerWindows Server 2003
2 Comments2 Solutions354 ViewsLast Modified:
Guys,

I need some urgent help. My users are receiving a bunch of System Undeliverable emails,a bout 50-100 at once maybe once a day for a random person.

it's showing as if the user is sending out the email and it's bouncing back to them saying the person they are sending it to does not exist.

How can i prevent this from happening and figure out if something on my network is sending out email? I've checked my system manager and tried to track the messages but i do not see  any messages sent from these users to the people in the system undeliverable emails.

I've also checked on port 25 and do not see anything suspicious but i do not have a constant monitor on port 25. Throughout the day however when i look at whose connecting through port 25 from my firewall it just shows the exchange server.

If this is a new way of spam can someone explain to me how they are getting this spam through so i can explain to my CTO? and also how can i prevent the users from getting all the undeliverables?

Thanks so much for your help.
ASKER CERTIFIED SOLUTION
Join our community to see this answer!
Unlock 2 Answers and 2 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 2 Answers and 2 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros