$smtp->data([bodydata])
Starts sending the body of the current message to the server. If specified,
bodydata can be a list or a reference to a list; the contents of the
list and the termination string .\r\n are sent to the
server. Returns true if accepted.
If bodydata is not specified, then a true result means that the
server is ready to receive data, which must be sent with the
datasend and dataend methods (inherited from Net::Cmd).