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Segmented notifications: when to use e‑mail, SMS or API
A practical guide to picking e‑mail, SMS or API for notifications. Criteria, cost‑benefit analysis and example workflows for large and small customers.
Quick answer
Pick the channel by urgency, recipient profile and integration effort: SMS for urgent delivery updates or recipients without constant internet access; e‑mail for detailed information, receipts and non‑urgent updates; API for automated high volumes and two‑way processes. Combine channels for reliability.
Why the channel matters
Notifications shape customer experience, response time and operational cost. The wrong channel can cause missed delivery windows, extra support work and unnecessary expense. Choose based on how fast the message must reach the recipient, how reliable delivery must be and how personalised the message should be.
Decision criteria
Consider urgency (delivery window), content type (short vs detailed), recipient access (mobile, e‑mail), data protection and integration effort. Cost per send, scalability and the need for reply channels (confirmations, feedback) are also key.
When to use e‑mail
E‑mail fits detailed shipment information, invoices and longer messages. It is cost‑effective at scale and easy to archive. Drawback: open rates vary and delivery is not always immediate.
When to use SMS
SMS works best for time‑sensitive messages: last‑minute delivery notices, one‑time codes or schedule changes. SMS has high visibility and low latency. Downsides are higher cost per message and limited text length.
When to use an API
APIs are ideal for real‑time automation, high volumes and two‑way workflows. With an API, systems exchange automatic status updates — pickup, in‑transit, delivered — and can accept confirmations. APIs reduce manual steps and let you filter notifications per recipient group.
Example workflows for small customers
Example: A small Swiss shop sends an order confirmation by e‑mail and a 30‑minute pre‑delivery SMS. This keeps costs low while ensuring crucial alerts reach customers quickly.
Frequently asked questions
How much does SMS cost compared with e‑mail?
Costs depend on provider and volume. SMS is typically more expensive per message than e‑mail. Factor in SMS effectiveness for urgent messages when comparing.
When does integrating a notification API pay off?
When you handle many shipments regularly, need real‑time status or want to automate processes. An API pays back by reducing manual work and speeding up responses.
Should I always use multiple channels?
Not always. Use multiple channels when you need redundancy or higher delivery rates. Routine info can go by e‑mail; critical alerts should use SMS or API.
How do I handle consent and data protection in Switzerland?
Collect explicit consent, store preferences and respect opt‑outs. SMS and marketing e‑mails often require clear permission. State purpose, retention and contact details in your privacy policy.