Port 25 check cause of "Unable to open a socket to Sendmail" error?

Hi



Since configuring a check for Sendmail I’ve started seeing an error from
our CodeIgniter PHP application for the first time:



Exit status code: 75
Unable to open a socket to Sendmail

The check is:



check process sendmail with pidfile /var/spool/postfix/pid/master.pid

start program = "/bin/systemctl postfix start"

stop program = "/bin/systemctl postfix stop"

restart program = "/bin/systemctl postfix restart"

if failed port 25 protocol smtp then restart

if 3 restarts within 5 cycles then unmonitor



I’m assuming then, that the port is unavailable to other services that need
it if Monit is checking it?



TIA

Jamie

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