I just finished setting up a mail server for the first time.  I am using 
POP3 and have disabled IMAP since I won't be using that.  I have a domain 
name that is in the DNS system on the Internet.  I have entered one of my 
hosts into the sendmail.cw file to allow it to relay for that host.  So far, 
I can send and recieve mail on that host using my mail server.  However, I 
would like to know if there is a way to allow specific users to relay with 
my machine?  I have a few friends I would like to set accounts up for on my 
machine.  they don't have static IPs and I really don't want to allow the 
aol.com or msn.com domains to relay through my machine.  Is there a way I 
can allow specific users to use my mail server only?

My other question regards portsentry.  I noticed that any machines that 
attempt to use my SMTP server that aren't in my sendmail.cw file get dumped 
into /etc/hosts.deny.  Is this normal behavior for Portsentry?  I didn't 
realize that trying to use port 25 from an unauthorized host would come off 
as a port scan.  This is just a curiosity to me.

TIA
G. Lenzer

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