troubleshooting Question

Getting flooded with NDRs of emails we never sent.

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Tyson0317 asked on
10 Comments2 Solutions551 ViewsLast Modified:
Hi guys, out of the blue a few users here have reported 200+ "System Administrator" notices coming back from emails that they never sent. This happens mostly overnight and an examination of the headers shows that they were sent from another mail server using fake names and our email addresses as the
"reply to" line...

In a few cases with our users that have cell-phone forwarded email, this flooded their cell phone also.

This is a bit annoying! What's an easy fix?

We run Exchange 2003 SBS with Outlook 2003.
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