Spam problem

I have an exchange server and SBS2003.  I am getting undeliverable email messages from my account.  it is as if i am sending a message to someone that does not exist and it bounces back.  the email address that it is sent to is always some type of spinoff of my address.  "myname"@domain.com .  It is sent to different domains. and it is always a spam message about porn or other interesting things.  is it possible that it is a spam message that is sent to me, but is allowed through my firewall and cloudmark spam program, because it thinks it is a message bouncing back to me.  When i check my sent messages it does not appear that i have sent anything.

Any help would be great
Thanks
securi-techAsked:
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SembeeCommented:
You are on the receiving end of an NDR attack.
This is where messages are sent to a server with an invalid address on purpose. The target server bounces the message back to the "sender". However the sender is spoofed and is the real target.

You are the spoofed sender.

Very little you can do about it.

Simon.
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