How to Send SMS to The United States (Rules & Deliverability)

Sending SMS to the United States? Local rules decide whether your messages arrive. Here is what you need to know.

SMS rules in the United States

US A2P traffic requires 10DLC brand and campaign registration (via TCR) for long codes, or toll-free verification; unregistered traffic is heavily throttled or blocked.

How to send reliably

• Register your sender ID and templates where required before sending.
• Get explicit consent and honor opt-out to stay compliant.
• Use approved A2P routes, not grey routes that get filtered.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability. It also welcomes the senders Amazon SES, SendGrid and Mailchimp reject — from $8, cheaper per email than SES. Run the free 10-second checker or see plans.