If you go to School > Communications > Setup > SMS Settings you’ll be able to set the signature that signs off all your texts.
You can shorten it down to anything you like, potentially saving SMS credits. You will need the ‘Communications: Setup School Communications’ permission to use this feature.
You can also choose to notify a member of staff when there is a reply to an SMS message. They will receive a notification in the top right of their page in Arbor.