Email API vs SMTP: Which Should Your App Use?

Sending email from an app comes down to two protocols: a modern HTTP API or classic SMTP. Both deliver mail; they differ in speed, features and how much code you write.

SMTP — the universal option

Almost every framework and CMS speaks SMTP. Drop in a host, port and credentials and you are sending. It is perfect for legacy systems and tools that only accept SMTP settings.

HTTP API — built for apps

• Faster: one HTTPS request, no multi-step SMTP handshake.
• Richer: templates, batch sends, tags, scheduling.
• Clearer errors: structured JSON instead of cryptic SMTP codes.
• Better observability: message ids that map to webhook events.

Which to choose

Use SMTP when you need drop-in compatibility or are migrating an existing app fast. Use the API when you want performance, templates and tight integration. The best part: a good provider gives you both on one account and reputation.

Get both

Sendersy exposes an HTTP API and SMTP side by side, with shared analytics and warm IPs. Grab your credentials free.