Strange SMTP Connectors showing up

I'm learning exchange 2003 and i've had two domains running on it for about 6 months. These are test domains and get very little traffic. This is exchange running on SBS 2003 BTW.

So i was looking under the first administration group today and under the server and queues i'm seeing two SMTP connectors that are trying to send out email as postmaster@mydomain.com.

Is this some kind of security issue on my part?

Thanks
helm
matt-helmAsked:
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SembeeConnect With a Mentor Commented:
Those are NDRs. It means that messages have been sent to the server to non-valid addresses and have been bounced.
As long as the server is fully up to date (Windows 2003 SP1 and Exchange 2003 SP2), you can nip these in the bud very easily.

Filter unknown users: http://www.amset.info/exchange/filter-unknown.asp
Tarpit: http://support.microsoft.com/default.aspx?kbid=842851

Simon.
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matt-helmAuthor Commented:
Excellent! Thanks!
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SembeeCommented:
Make sure that you do both - otherwise you could leave the server open to attack.

Simon.
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