ConfigServer Community Forum

OpenVZ kernels now have the module ipt_owner virtualized so using the SMTP_BLOCK should be possible for VPSes. I did use a vps to connect to SMTP server of a shared hosting I have and sent mail successfully by cleancode.org email tool, after this I issued: "iptables -I OUTPUT -p tcp --dport 25 ...

as the function of csf.allow is to let traffic be sent to or come from a whitelisted IP, it should be able to bypass the UID/GID limit for port 25, For example in a case we had to use a remote smtp of an off server bought mail account for the whmcs script, the off server mail account is used for red...