Reminder : Restrict port 25 at the Firewall (outbound)
Nov 20, 2007 in Tips and techniques
Too many IT administrators forget to restrict wich IP addresses on their network can send email out, I mean to use SMTP Outbound
It’s providing virus Writer/Spammer an easy way for any infected stations to Spam the planet.
Only eMail server should be able to go out on port 25..
Probably some of your already experienced how painfull it could be to be removed from IP addresses BlackList… Often we endup changing IP as a shortcut (for for how long)
Note : Several eMail security provider or eMail security product product allow customer to make their Outgoing email be filtered.