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, Plivo 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 or messages to a particular To number is dormant for the last 15 days, any established mapping is removed and will not be referenced. 

When a Plivo phone number is removed from your Messaging Service, all Sticky Sender mappings associated with the removed Plivo number are deleted.