Check if a connect to a configured MTA works and the reply of a "HELO" command is 250
SMTP is the enclosing tag for all smtp servers to check.
0 or 1. If you don't define SMTP, no smtp check will run.
<SMTP>
<SMTPCHECK>
<CHECKPOINTNAME>smtp-server01</CHECKPOINTNAME>
<HOST>192.168.1.1</HOST>
<ERRORLEVEL>ERROR</ERRORLEVEL>
</SMTPCHECK>
<SMTPCHECK>
<CHECKPOINTNAME>smtp-server02</CHECKPOINTNAME>
<HOST>192.168.1.2</HOST>
<ERRORLEVEL>ERROR</ERRORLEVEL>
</SMTPCHECK>
</SMTP>
for every smtp server you want to check you you define the SMTPCHECK-pair
The common XML tags as described in Section 9.8, “Tags Common to All Checks and/or Checkpoints”
As many as you like.
Look at SMTP