csf firewall set email smtp alert port number

For mail servers listens on non-standard port numbers

Find in /etc/csf/cs.conf these lines:

# By default, lfd will send all alerts using the SENDMAIL binary. To send using
# SMTP directly, you can set the following to a relaying SMTP server, e.g.
# "127.0.0.1". Leave this setting blank to use SENDMAIL
LF_ALERT_SMTP = ""

and change to your smtp server:port. For example

# By default, lfd will send all alerts using the SENDMAIL binary. To send using
# SMTP directly, you can set the following to a relaying SMTP server, e.g.
# "127.0.0.1". Leave this setting blank to use SENDMAIL
LF_ALERT_SMTP = "mymailserver.example.com.ua:27"

Then restart csf

# csf -r

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