We have an in house e-mail-to-SMS system that allows messages to be sent to
mobile devices with the address format <mobile number>@sms.server.name. GMS
server appears to use this format to send the trigger SMS messages for the
SMS push option, is there a special format required for these messages or
can they only be provided by the mobile service provider. I understand that
the messages are 'invisible' to the end user so I am concerned that even if
this would work the end users would see the messages accumulating in their
SMS inbox.