Block outgoing SMTP -
Block outgoing SMTP except for root, qmail/postfix and mailman. This forces scripts/users to use the qmail/postfix binary instead of sockets access. This option requires the iptables ipt_owner/xt_owner module to be loaded.
Default: 0 Range: 0-1
Allow local connections -
Allow outgoing SMTP connections to the loopback device on port 25 (If
SMTP_BLOCK is enabled).
Default: 1 Range: 0-1
SMTP ports -
SMTP ports to block. You should list all ports that qmail/postfix is configured to listen on.
SMTP redirect -
Redirect outgoing SMTP connections destined for remote servers for non-bypass users to the local SMTP server to force local relaying of email. Such email may require authentication (SMTP AUTH). Default: 25,465,587
SMTP allowed users -
Allow the following comma separated users to bypass SMTP_BLOCK. Note: root user is always allowed.
SMTP allowed groups -
Allow the following comma separated groups to bypass
SMTP_BLOCK. Note: root group is always allowed.