A comma separated list of addresses for destinations (required).
The SendTo property specifies a comma separated list of destinations for the mail message. A copy of the message is sent to each of them, and a To SMTP header is created containing the destination addresses.
Examples of valid addresses are: "Friendly Name" <firstname.lastname@example.org> or email@example.com
The task will stop processing the message and log an error if the SMTPServer returns an error code about any email address specified in SendTo or Cc, but it will only log warnings if the same happens with an email address specified in BCc.
This property is not available in the Receiver.