Solved

Exchange 2010 User Mailbox Seems to be compromised

Posted on 2013-01-17
1
999 Views
Last Modified: 2013-01-23
I have a single user out of 100s that is getting tons of undelivered messages from our local Exchange Server. When examining the messages it indicates there were 100 intended recipients with the majority being delivered. Many foreign domains are listed. We have scanned the users  desktop and the Exchange server for viruses, but both come up clean. There is a possibility her send address is being spoofed....

I am not confident the proper logging is running to help find the issue.

Need help in investigating and resolving the issue. (I am not an Exchange experts)
0
Comment
Question by:tamray_tech
1 Comment
 
LVL 63

Accepted Solution

by:
Simon Butler (Sembee) earned 500 total points
ID: 38789576
Sounds like spoofing of the sender address and the NDRs are bouncing back. Not a lot you can do about it as they are NDRs which you have to accept. If you try and block them you will get blacklisted.

I would be surprised if the mailbox was compromised, a spammer is just using the address as the from address and the rejects are coming that way. Looking at the headers may give you some clue as to the source, and ensure that it isn't your server. Your queues would be full if your server was being used as spammer's lists are not clean.

Simon.
0

Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
Not sure what the best email signature size is? Are you worried about email signature image size? Follow this best practice guide.
In this video we show how to create a Distribution Group in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >>…
To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now