SpamPal can be set up as an
SMTP relay server between the internet
and your incoming mail server. This provides
spam tagging for all email coming to your mail server.
I'm assuming
that you have a router or firewall forwarding port 25 from your public
IP address, to protect your network. Using Exchange as
the mail server software name (doesn't matter what you're really
using). For all configurations on the internet side of an incoming mail
server:
1. Go to Advanced/LAN
Configuration and change the IP address
to the public IP address, like 192.168.1.1 , instead of 127.0.0.1.
2. Go to Advanced/Access
Control and add either 0.0.0.1-255.255.255.255 or 0.0.0.0/32 to the Access Control List
If you have two computers, one for SpamPal and one for the mail
server:
Starting with:
192.168.1.1 Exchange listening on port 25
192.168.1.2 SpamPal on local port 25, server 192.168.1.1:25
router using NAT to forward port 25 to 192.168.1.1
Change to:
192.168.1.1 Exchange listening on port 25
192.168.1.2 SpamPal on local
port 25, server 192.168.1.1:25
* router using NAT to forward port 25 to 192.168.1.2
This all assumes two computers. It's very safe because a quick
change to your router can bypass SpamPal and the filtering.
If you have one computer:
Start:
192.168.1.1 Exchange listening on port 25
192.168.1.2 SpamPal on local port 25 on test machine, server 192.168.1.1:25
router using NAT to forward port 25 to 192.168.1.1
and test to make sure that SMTP to the SpamPal machine gets to
the Exchange server. This is safe because your real mail still
works fine - it goes directly to Exchange.
First change to:
*192.168.1.1 Exchange listening on port ANY OTHER, say 32025
*192.168.1.2 SpamPal on local port 25 on test machine, server 192.168.1.1:32025
router using NAT to forward port 25 to 192.168.1.1
and test to ensure that an SMTP connection to 192.168.1.2 port
25 gets to the Exchange server listening on port 32025. If it doesn't,
fix this Exchange configuration problem first. This is risky because
while you're in this state, your mail is cut off.
Then quickly change to:
192.168.1.1 Exchange listening on port ANY OTHER, say 32025
*192.168.1.1 SpamPal listening on port 25 local, server localhost:32025
192.168.1.2 SpamPal on port 25 on
test machine, server 192.168.1.1:32025
router using NAT to forward port 25 to 192.168.1.1
and test to make sure that it works. Until it does, your mail
is cut off.
The test machine here is just to give you a chance to verify the
SpamPal and Exchange settings. Any workstation will do, since it
doesn't have to handle all of your mail traffic. You can temporaruily
have the router forward port 25 to it just to verify that all is
working as you expect, then point it back to the main machine before
running it all on the single machine.
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