By default, email signatures and disclaimers will send through email to SMS. This can be removed with the use of end tags before the signature.
Disable email signatures in E2S Messages
1. In the menu, click on the Settings menu item, then select Messaging Settings.
2. FInd where it says Email to SMS, and click on Update:
3. Next to the Settings heading, click on Edit:
4. Enter your desired end tag or use our default ones.
5. Now click OK to save your changes and you're done: