SMS & Snail Mail
Last update:
07/21/2026
Completed
In this topic
SMS Overview
- Introduction to SMS Messaging
- Sending Single & Bulk SMS
- Sending a Physical (Postal) Letter
- Managing Cost & Choosing the Right Channel
Templates & Bulk Sending
Snail Mail (Physical Letters)
Costs & Best Practices
Managing Cost & Choosing the Right Channel
Every Channel Has a Real Per-Message Cost
Unlike email, both SMS and Snailmail cost real money per message/letter sent (credits, Twilio charges, or per-letter postal fees) — worth factoring into any automation that fires per-transaction at volume.
Choosing a Channel
| Channel | Best For |
|---|---|
| Default for anything with detail/attachments; free, high volume. | |
| SMS | Time-sensitive, short alerts likely to be seen fast (appointment reminders, OTP-style codes, delivery notices). |
| Richer interactive notifications where the customer already engages on WhatsApp. | |
| Snail Mail | Formal/legal notices, or reaching contacts with no reliable digital channel. |
Best Practices
- Keep SMS templates short and purposeful — reserve it for messages people actually need to see quickly.
- Validate postal addresses before triggering bulk Snailmail — a bad address wastes the letter's cost entirely.
- Monitor Error states on both channels the same way you'd monitor bounced emails — a silent failure means the customer never actually got the message.
- Respect opt-outs and local regulations for SMS marketing exactly as strictly as for email (see the Email Marketing course's compliance article) — SMS regulations in many jurisdictions are at least as strict.
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