Changelog

From now on, all Mailtrap webhooks will include cryptographic signatures, so you can verify that incoming requests genuinely come from us and haven't been tampered with.

If you use webhooks for deliverability monitoring, CRM sync, or auditing, this adds an extra layer of security using industry-standard cryptographic verification.

Notes:

• Every webhook request is signed automatically

• You can confirm the request originated from Mailtrap before processing it

• No action needed to enable it — all existing webhooks will include signatures

To find your signature key, simply navigate to the webhook you want to configure, and it will be displayed in the webhook details.

You can now connect your Vercel project to Mailtrap Email API and automatically configure the necessary environment variables into your Vercel environments in a few steps. This removes setup friction, minimizes configuration mistakes, and lets you test and send emails at scale with high inboxing rates and fast delivery speed.

For step-by-step instructions on how to integrate Vercel with Mailtrap, feel free to read our Knowledge Base article. ⬅️

Hi there,

Mailtrap now supports Dark Theme across the entire platform! The theme is perfect for reducing digital fatigue and avoiding the switch between light and dark UIs, and it’s also one of your most requested features. 🌙

You can toggle Dark Theme in the lower-left corner of the screen, or if you have dark mode on your system, it will be switched on automatically.

Hi there!

We have just launched the Email Throttling feature, which lets you spread campaign delivery over time instead of sending your marketing emails at once.

How it works: Set a maximum number of emails per hour (e.g., 100/hour), and Mailtrap will automatically pace delivery to stay within your limit. This way, you can use it to:

• Improve deliverability – Mimic natural sending behavior and build trust with ISPs over time.

• Protect sender reputation – Avoid being flagged as suspicious by Gmail, Outlook, etc.

• Manage server load – Ensure receiving servers process your emails smoothly.

Who is it for:

• Warming up sender reputation (even for smaller batches of a few hundred).

• Managing large-scale campaigns (50K+) without triggering volume-based limitations.

Note: Available for all users sending email campaigns through the UI.

You can now access your email sending stats programmatically via our new Stats API — the same data you see in your Stats dashboard, now available through API endpoints.

Available endpoints:

• stats – Sending stats

• GET https://mailtrap.io/api/accounts/{account_id}/stats/domains– Sending stats by domains

• categories – Sending stats by categories (e.g., welcome emails, password resets, etc.)

• email_service_providers – Sending stats by email service providers (e.g., Gmail, Yahoo, etc.)

• date – Sending stats by date

Additionally, you can filter the stats by date range, sending domains, sending streams (transactional/bulk), categories, and email service providers.

Stats included: delivery, bounce, open, click, and spam counts and rates.

For more information on the Sending Stats API, please read the official API documentation.

You can now connect your Supabase project to Mailtrap and inject production-ready SMTP credentials into your project with just a few clicks. Once connected, the project SMTP settings are set, you are no longer limited by Supabase's default limits, and you can check email logs and statistics in your Mailtrap account.

How it works: 

1. In Mailtrap, go to Integrations → Supabase.

2. Authorize Mailtrap, select your project, and create an API token.

3. Configure sender details like name and email.

For step-by-step instructions on how to integrate Supabase with Mailtrap, feel free to read our Knowledge Base article or watch our YouTube video. 👀

Note: Currently, this integration supports Sending Domains (API/SMTP) only and does not include Email Sandbox configuration. If you would like to see Sandbox support in the future, please leave a feature request here.

Sweater weather hits different when you’re shipping new features 🍂 ☕

See our newest Product Updates video here: https://youtu.be/fYK4Nm5J7rA

Hi there,

We've just launched Organization & Sub-accounts feature - a more holistic way to manage multiple projects, clients, teams, or apps under one roof. 

With this update, you can now:

• Create Sub-accounts under your main organization.

• Isolate stats, logs, and API keys for each project, client, or app.

• Control user access for team members.

• Get a single, consolidated bill for all sub-accounts.

Available for all Business and Enterprise plans, so if you’re not on one yet, this is the perfect moment to upgrade and start simplifying your workflow.

To create your first Sub-account, simply go to the Organization page in your Settings.