The name or address of a mail server (mail relay).
The SMTPServer property specifies the IP address (IP number in dotted internet format) or Domain Name for a mail relay through which messages will be routed.
The current version of the task does not provide a default value for the mail relay. You must provide a host name yourself. Generally, any internet host with an SMTP server will suffice (a UNIX host for example), but it is preferable to select an SMTPServer that is close to the machine sending mail.
This property is not available in the Receiver.