Sticky Sender makes sure the same From phone number is selected when messaging a particular recipient. This allows your application to consistently send messages to your user from a single recognizable phone number.
When Sticky Sender is enabled, Twilio will maintain a mapping of the To and From phone numbers. This mapping is created after the first message is sent from your Messaging Service to a particular recipient. Any future messages sent to that recipient from that Messaging Service will also use the same ‘From’ number.
If Sticky Sender is turned off, any established mapping will not be referenced. However, if you toggle Sticky Sender back on in the future, any mappings previously created will be referenced again.
When a Twilio phone number is removed from your Messaging Service, all Sticky Sender mappings associated to the removed Twilio number are deleted.
Learn more in our Sending Messages with Copilot documentation!