Security in SMTP Virtual Server

Hi!

I'm using a POP3 service and SMTP Service of Windows 2003 server to setup a
small Mail Server Enviroment.

In my "Default SMTP Virtual Server" -> Properties -> Access ->
Authentication I need to allow "Anonymous Acces". If I don't do that, people
can't send me mail's. My question is:

This "Anonymous Access" don't open my SMTP Server to SPAMMERS?

How I know that my SMTP Server is protected and only authenticate users can
send mail through his?

Thanks for anything,

Andrew


.

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