Support

Guides, Articles and Frequently Asked Questions






  Index | Outbound Filter

How can I force the use of the smart host?


If you use scripts on your server, they can be misused by spammers to send messages directly over port 25 without being filtered through our outgoing filter. Actually, there is no reason why a script should be able to send messages via port 25.


To prevent outgoing connections over port 25 and to pass all traffic through the EuropeanMX filter, you can use the following IP tables in your firewall:

IPv4:
Add:
iptables -A OUTPUT -p tcp --dport 25 -j DROP
Remove:
iptables -D OUTPUT -p tcp --dport 25 -j DROP

 

IPv6:
Add:
ip6tables -A OUTPUT -p tcp --dport 25 -j DROP
Remove:
ip6tables -D OUTPUT -p tcp --dport 25 -j DROP

 

Please make sure that the rules are applied automatically after a restart.


Was this article helpful?




This site makes use of cookies to enhance browsing experience and provide additional functionality. By continuing to browse this website you are agreeing to our use of cookies. OK