You can set Triggers to automate some actions for you. Here is a Trigger for having clients remove themselves from your list for no longer receiving future communications. This helps you avoid from being flagged for SPAM.
You will select Triggers in the left-hand menu to begin
You will select a New Trigger. You will need to name it and select what Type of trigger this will be (“SMS” for texting Keywords).
Next, you will select what Phone Number the Trigger will be applied to. Then from the Type of Condition dropdown you will select Regular Expression.
You will copy paste this code to use in the Value Field: /(^(stop|unsubscribe|remove)|invalid number|wrong number|remove me)/i -And from the Type of Action dropdown you will select Add Contact to Blacklist