Transactional Email API

High deliverability rates by default.
SDKs for all major programming languages.
In-depth deliverability monitoring.

Why send emails with Mailtrap Transactional API

Ready-to-use integrations

Use our code snippets for major programming languages and quickly integrate Mailtrap with your app, saving both your effort and time.

Automatic email authentication

Mailtrap provides and automatically validates all the necessary DNS records (SPF, DKIM, DMARC). Moreover, DKIM keys are rotated quarterly.

Separate Bulk Stream

Send marketing emails on top of transactional from a single platform. Separate streams will keep high deliverability.

Actionable analytics

Helicopter-view dashboard, drill-down reports, detailed stats for major mailbox providers, and email logs with up to 60 days of historical data.

Email templates

Save time on crafting your campaigns. Mailtrap email templates to reuse, upload, or create designs from scratch.

Highly responsive customer support

You can rely on fast, quality assistance from our dedicated team of Deliverability Experts whom you can contact by request and for free.

Trusted by 150,000+ monthly active users

Start sending with Mailtrap Transactional Email API

Create a free account and verify sending domain

Sign up for a Mailtrap account, navigate to Sending Domains, add your domain, get DNS records, and verify your domain.
Integrate with your application

Under SMTP/API Settings, choose Transactional Stream, click API, and use the provided credentials to integrate with your app.
Send emails

Start sending transactional messages and reach recipients’ inboxes just in time with ready-made code samples.

From our #BestClientsEver

Joshua Anderton

@joshuaanderton

Just signed up for @Mailtrap and I’m loving it. So easy to set up. Provides so much peace of mind. Ahh just love it.

7:38 PM – Jan 13, 2021

DeveloperMitch

@mitchellfinlay

After all these years of web development, how have I only JUST started using @Mailtrap. I had heard about it, but never got round to using it. An awesome way of testing emails.

1:25 PM – Nov 07, 2020

Alessandro Rodi

@coorasse

I love @Mailtrap. It removes all the asshole of configuring email servers in test environments. Great service! Is totally worth your money!

1:15 PM – Oct 20, 2020

Mr. Glass

@MisterGlass

Shout out to @Mailtrap, hands down the best way to handle mail sending in local/test environments.

11:43 PM – May 21, 2020

Rado Georgiev

@Rado_g

One thing we started using recently is @Mailtrap for our dev & staging environments. We were previously either turning email sending entirely off for staging or running SES + whitelist. Turns out, having a fake SMTP mailbox is great and you can test better with it.

1:32 PM – Jan 06, 2021

Doug Black Jr

@dougblackjr

Can we all agree @Mailtrap is a gift to developers everywhere? It just works SO easily out of the box!!!!

9:45 PM – Aug 11, 2020

Get More Out of Mailtrap

Spam Checker

Use Mailtrap built-in spam score checker to identify the level of spam metrics, and ensure your emails always land in the inbox.

Email Testing

Capture SMTP traffic from staging and dev environments. Analyze email content for spam score and validate HTML/CSS.

SMTP Service

Send your application emails. Multiple languages for quick and easy integration.