How do I make sure I don't text someone that has requested I stop messages?

I received a text response indicating that the contact wants no further communication from me. How can I make sure I don’t contact them again?

• If the contact responded with the word STOP, they will automatically be added to your account wide Do Not Contact list and excluded from any future broadcasts.
• Opt outs will not occur automatically if Do Not Call list on your account's Settings page is disabled. (this account setting is enabled by default)
• If the contact responds with something other than the word “stop”, you may need to add them manually.
1. Click “Contact Lists” from the left navigation panel
2. Click on “DNC List”
3. Search for the contact.
4. If your search returns no results, manually enter the number into your Do Not Contact list.