Email API vs SMTP in Grenada

Grenadian businesses send automatic emails from many kinds of software: a hotel booking engine, a WordPress shop, an accounting package, a school management system or a custom app. Mailpro supports two ways of connecting them: SMTP relay and a REST API. Both deliver your email through the same infrastructure. The difference is how your software talks to Mailpro.

SMTP in brief

SMTP (Simple Mail Transfer Protocol) is the standard way email moves between servers. Almost every piece of software that sends email already supports it. You enter Mailpro’s server name, port, username and password in your application’s settings, and it starts sending through Mailpro. See Mailpro’s SMTP server.

API in brief

An API (application programming interface) lets your code send structured requests to Mailpro over HTTPS: send this email, add this contact, fetch these statistics. It requires some development work but offers finer control. See the Mailpro API.

Side-by-side comparison

Which suits your Grenadian business?

Choose SMTP if…

• You run a WordPress or WooCommerce site selling spices, crafts or tours and want reliable order emails.
• Your hotel’s booking or property management software has an SMTP setting.
• You don’t have an in-house developer.

Choose the API if…

• A local or regional developer is building a custom booking platform, delivery app or student portal.
• You want your system to react automatically to bounces or clicks through webhooks.
• You need to sync contacts between your app and Mailpro.

Or use both

Many organisations do. A resort might send booking confirmations through SMTP from its property management system and use the API to sync guest contacts into marketing lists, with consent recorded, for automated emails.

What stays the same

Whichever you choose, your emails go through the same Swiss-hosted infrastructure, protected by TLS 1.3, outside US jurisdiction. You get the same authentication options (SPF, DKIM, DMARC), the same reporting and the same send-based pricing. Both approaches support personalised content.

Data protection

Transactional emails contain personal data: names, bookings, amounts. Grenada’s Data Protection Act, 2023 is not yet in force, but it sets clear security expectations, and overseas customers may be protected by the GDPR or similar laws. Mailpro is built for GDPR and never sells or rents data.

A closer look at setup for each option

Connecting by SMTP

In most applications, you will find the email settings under a heading such as “outgoing mail”, “mail server” or “SMTP”. Enter the Mailpro host name, choose an encrypted port, add your SMTP username and password, and set the “from” address to one on your own domain. Send a test from the application, then look for it in your Mailpro logs. For a typical Grenadian small business website, the whole process takes less than an hour, including the DNS records for authentication.

Connecting by API

With the API, your developer generates an API key in Mailpro and writes code that calls the relevant endpoints: send a message, add a contact, fetch a report. Because the request is structured, your code can attach data such as a booking reference or guest name and receive a response it can store. That makes the API well suited to platforms that need to keep their own record of what was sent, for example a tour booking system that shows each customer’s confirmation history.

Performance in busy periods

Traffic from Grenadian businesses is rarely steady. Bookings spike when the winter high season opens, when Spicemas dates are announced and during holiday sales. Both SMTP and API sending scale with your volume, and because Mailpro prices by the messages you send rather than by contacts stored, a busy month costs more and a quiet month costs less. If you expect a large burst, such as a festival ticket release, test your setup a few days before with a realistic volume.

Security considerations

• Keep SMTP passwords and API keys out of public code repositories and shared documents.
• Give each application its own credentials, so you can revoke one without affecting the others.
• Use encrypted connections only. Mailpro supports TLS 1.3.
• Review who in your organisation, or at your web agency, has access to the credentials, especially when staff or suppliers change.

Common mistakes to avoid

The most frequent problem we see is a website that sends from a free email address, such as a Gmail account, through a third-party server. Mailbox providers treat this as suspicious, and the messages end up in spam. Always send from your own domain and authenticate it. The second is mixing marketing and transactional messages in the same stream: keep booking confirmations clean and send promotions through campaigns, to people who opted in.

Frequently asked questions

Can I switch from SMTP to the API later?

Yes. Your account, domain authentication and statistics stay the same. Many businesses start with SMTP and move specific message types to the API as their platform grows.

Will my emails go out faster with one or the other?

Both hand your messages to the same sending infrastructure. Differences in speed usually come from your own application, not the connection method.

Still unsure? Our SMTP and API FAQ answers common questions, and API statistics explains how to track results.