If you have a signature on your email or you only want to send part of the information in the email as an SMS, you can use markers to indicate the beginning and end of your SMS message, or you can put the SMS content in the subject line. 

The markers --begin and/or --end in your email message, specify which parts of your message you want to be sent as an SMS.

You can indicate the beginning and end of the SMS message with --begin and --end as shown. 

You can also configure the domain settings you want the subject line of the email to have and a default originator.