Transactional vs marketing SMS: where the line really is
How to classify your traffic correctly — and why it matters for deliverability, pricing, and compliance.
Why the classification matters
Carriers price transactional and marketing traffic differently. They also filter them differently — a marketing message dressed up as transactional gets caught by carrier filters, kills your sender reputation, and hurts delivery on everything else you send. Classify correctly from day one.
Transactional: initiated by the recipient's action
Verification codes (signup, 2FA, password reset). Account events (login from new device, payment confirmation). Delivery updates (order placed, shipped, out for delivery). Appointment reminders (booked events, cancellations). The rule of thumb: would the recipient be surprised to receive this, given they just did an action that triggered it? If yes, it's marketing.
Marketing: initiated by the sender
Promotional offers, newsletters, product launches, re-engagement campaigns, abandoned-cart nudges (yes, even these — they're sender-initiated). Opt-in is required, STOP must be honored, and dedicated marketing-tier routes apply.
Gray zones
Shipping updates that include an upsell? Becomes marketing. Appointment reminder with a coupon? Marketing. Account alert with a CTA unrelated to the alert? Marketing. When in doubt, route as marketing and keep opt-in documented. The cost difference is small; the deliverability hit from misclassification is not.
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