SMTP server's port. (default value: 25)
OK status code: The SMTP server signals that it is ready to send mail with the OK status code. (default value: 220)
Please change this value only if the SMTP server is not on standard configuration.
This parameter is used as sender address for the MAILTO command. It is only
needed for the monitoring of Microsoft Exchange servers.
Time in seconds before a connection attempt times out.
If a timeout occurs, the status of the check is changed to Critical.