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2820vn - Blocking SMTP 25 on outgoing traffic

  • unrealone1
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12 Nov 2010 00:07 #1 by unrealone1
2820vn - Blocking SMTP 25 on outgoing traffic was created by unrealone1
Hi there,

I have had problems with our IP address getting blocked for spamming, possibly an infected PC on our LAN.

Can someone please provide instructions on how to block outgoing port 25 on the network 192.168.1.2-192.168.1.254

192.168.1.1 is the mailserver.

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17 Nov 2010 20:36 #2 by steveo888
Replied by steveo888 on topic block 25
Filter set 2 Rule 2
1. set a "block if no further match", leave everything blank bar:

direction =lan>wan
destination port = 25
protocol = tcp

(this will block all outgoing mail)

2. set a "pass immediately"

direction = lan>wan
source ip = your smtp server lan address
destination port = 25
protocol = tcp

worked for me!

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