Possible Worm or Virus?

I’ve got an unusual problem and I can’t seem to find any information about it - I’d appreciate ANY help!!

Here’s the situation:

User X sent an email to company.com with two (normal) attachments

About 10 mins later, User Y sent an e-mail to company2.com with just text.

User X called me saying that company.com had sent him a reply wondering if he didn’t send him the wrong information,

what they actually got was USER Y’s E-MAIL with text at the top that was similar to this:

MAIL FROM:

RCPT TO:

RSET

This text is repeated over and over, with all valid users listed in the “FROM” field…

I checked the properties of both original pieces of e-mail, but there is nothing suspicious there.

We have very tight security in that our SMTP settings are locked down to only allow from our specific servers (by IP address.)

We also use MessageLabs service to reject any e-mail sent from “ourcompanyname.com” that doesn’t come from our specific IP…

I’ve opened a PMR, but haven’t gotten any real help yet other than USER Y might have a virus\worm…

However, our PC Support has been at the computers for BOTH user X and Y, and they haven’t been able to find anything!

We’re using McAfee VirusScan Enterprise 8.0.0

Can anyone please help me here??

Thanks so much!

-Molly

Subject: Possible Worm or Virus??

Hi Molly,

Have you managed to get to the bottom of this or had any progress with your PMR because we have had a similar issue with internal messages? In our case, a receipient of a message opened the email and it then started to send the message repeatedly to all the recipients with extra lines at the begining of the message. The header also says ‘original sender’ sent by ‘receipient’. The receipients location document is correct and does not contain the senders mail file info.

Regards,

Craig

Subject: Possible Worm or Virus??

one think you might want to check is the location document of user x and see if user y email is listed there,on internet email address field. Does this happen with all email user x sends or just this particular company.