Hi,
Is there a way to limit of using SMTP in my IPs? So we are trying to create Firewall Raw rules with the following config.
IP Firewall Raw
Chain: prerouting
Src-Address-List: !Whitelist-SMTP (So I create address-list to whitelist SMTP)
Protocol: TCP
Source Port: 25
Action: Drop
But eventually, all incoming and Outgoing SMTP are being blocked. Im planning only to block for spammers to use our IP Address as SMTP Mail Relay.
Secondly, can I limit all email send out? For example 50 email per hour for every IPs?
Thank you very much for all advice...
Sincerely,
Hernan