Setting up a mailserver.. some questions

Hi,

I want to setup a small mailserver for myself and my domains (low 
traffic). I will (try to) integrate antivirus and spam scanning etc. I 
have a few questions about overall configuration... I'm using TSL 3.0 btw.

1) Should I keep mail for one domain local/non-virtual, or is it best to 
go all virtual since I'll have to do the other domains as virtual?

2) I also have a email account with my ISP. I get _LOTS_ of spam but I 
don't want to cancel the emailaccount. Thunderbird (on windows) is NOT 
doing a good job filtering out all my spam. Say I create an email 
account named "pop3ext" in "mydomain.com" domain. Is it possible to have 
my email server download my pop3 email from my ISP and do the spam/virus 
scan and then store it/deliver it to the "[email protected]" account 
on my mailserver?

3) My soon to be mailserver is behind an IPcop firewall (which has a 
static IP). I will open up port-forwarding for port 25 into the server. 
Do I have to (or should I) set the "proxy_interfaces" variable?

/Christopher
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