Yes, contacts who have opted out from receiving your messages can opt back in by replying with the keywords:
Unstop
Start
Note: The keywords UNSTOP and START are NOT case sensitive.
Note: You can also manually re-opt in contacts via MXT.
Steps on how recipients can re-opt in via SMS (if they have previously opted out)
Yes, contacts who have opted out from receiving your messages can opt back in by replying with the keywords:
Unstop
Start
Note: The keywords UNSTOP and START are NOT case sensitive.
Note: You can also manually re-opt in contacts via MXT.