HighSMS has built-in tools to keep your messaging compliant and protect your phone numbers from getting flagged.
STOP Opt-Out Handling
Enable STOP compliance per device in your Devices settings. Once enabled:
- The first message to a new number automatically includes an opt-out footer
- If someone replies STOP, END, CANCEL, QUIT, or UNSUBSCRIBE, they're automatically blocked from future messages
- If they text START, they're re-subscribed
Your opt-out list stays with your account — even if you delete a device, the list is preserved.
Opt-Out Rate Protection
HighSMS watches your opt-out rate automatically. If too many recipients are replying STOP, sending pauses to protect your number. It resumes automatically once the rate drops back down.
Best Practices
- Only message people who have opted in to hear from you
- Use SMS warmup for new SIM cards
- Use spintax so every message is slightly different