mailtrap-sending-emails
Lets your agent configure email sending through Mailtrap. It helps send transactional emails, in bulk, or in batches.
What it does
This tool helps you send real emails through Mailtrap. You can set up sending using the Email API or SMTP, whether for transactional emails (like order confirmations) or bulk emails (like newsletters).
When to use it
- ✓Configuring password confirmation email sending.
- ✓Sending promotional newsletters to your customers.
- ✓Troubleshooting the sending of automatic notifications from your application.
Example of what to ask your AI
“How do I set up Mailtrap to send transactional emails using the API?”
Want more? Open the sections below.
How to use
The easiest way: copy the message below and paste it into Claude, ChatGPT, Cursor or any AI. It reads the skill and follows the instructions.
Skill link
Ready-to-paste message
How it works
Mailtrap offers different ways to send emails, such as a direct API or SMTP settings. You choose the best option depending on whether the email is a system notification (transactional) or a marketing campaign (bulk).
Installation
Easiest way: copy the skill link and paste it into Claude, ChatGPT or Cursor asking it to follow the instructions.
In the terminal (Claude Code, Codex, Cursor), in your project folder:
npx skills add sickn33/agentic-awesome-skills --skill mailtrap-sending-emailsOr download just the file:
curl -L https://raw.githubusercontent.com/sickn33/agentic-awesome-skills/main/plugins/agentic-awesome-skills-claude/skills/mailtrap-sending-emails/SKILL.md -o SKILL.mdTechnical content (original SKILL.md)
Original text by the author, straight from GitHub.
Sending emails (Mailtrap)
Overview
Mailtrap sends live email over Email API (REST) or SMTP. Two streams apply for API/SMTP: Transactional (non-promotional, app-generated) and Bulk (promotional / marketing volume). Batch is not a third stream: it is how you submit many messages in one request on whichever stream matches the content. Campaigns are a separate product path for promotional mail to Mailtrap contacts. Pair this sheet with the Transactional / Bulk developer pages when building or debugging integrations (including with AI-assisted coding).
When to Use
Use when integrating, configuring, or troubleshooting Mailtrap live email sending with Email API, SMTP, transactional streams, bulk streams, or batch requests.
How to integrate (preference order)
Preferred order:
- Plugin or integration for the user's platform (no-code or minimal-config) where available
- Official SDK for your language when one exists (maintained clients, typed helpers, less room for URL/auth mistakes).
- HTTP Email API when there is no SDK or the SDK does not fit (direct
POSTto/api/sendor/api/batchwith JSON). - SMTP only when you really need it (legacy stack, host/platform that only speaks SMTP, or hard constraints that rule out HTTP).
Choosing how to send
| Approach | Use when |
|---|---|
| Transactional, single message | Email generated by your app (password resets, receipts, notifications, alerts). One logical message per POST https://send.api.mailtrap.io/api/send |
| Bulk | Promotional email to contacts that you manage on your side and send at volume through Mailtrap. Not the same as "batch": bulk is the stream, not the batch endpoint. |
| Batch | You have multiple different messages to hand off at the same time (up to 500 per request). Cuts HTTP overhead; can be applied to both transactional and bulk |
| Campaigns | Promotional email to recipients stored as Mailtrap contacts, using Mailtrap Campaigns (audiences, scheduling, reporting in the product). Recommended to avoid implementing contact management and email sending logic; requires UI setup before sends flow—this skill does not replace that workflow. |
Before generating SDK code: read the README of the relevant SDK repository linked in the SDKs section below for current method signatures, constructor options, and examples. Do not rely on memory.
Related skills: mailtrap-testing-with-sandbox (safe testing) and mailtrap-setting-up-sending-domain (verification before send).
When not to use
- Sandbox only—capturing mail without delivery, reading messages in a sandbox (
mailtrap-testing-with-sandbox). - The main ask is webhooks, step-by-step Campaigns UI setup, or deliverability deep-dives.
- Exhaustive API reference—once the user's path is clear, link the official send docs for full schemas, optional fields, and edge cases.
Quick reference
Email API
…
FAQ
What's the difference between transactional and bulk email?
Transactional emails are generated by your application (e.g., password resets, receipts). Bulk emails are for marketing or promotions, sent in large volumes.
What is 'batch'?
'Batch' means sending multiple different messages in a single request to optimize sending, and can be used for both transactional and bulk emails.
Can I use this to test emails without sending them?
No, this tool is for sending real emails. For testing without sending, use the 'mailtrap-testing-with-sandbox' skill.
Details
Original description by the author
Configure or troubleshoot Mailtrap live email sending with Email API, SMTP, transactional streams, bulk streams, or batches.
Popularity
- GitHub stars
- 48k
- Ranking position
- #3520
- License
- MIT
- Updated
- 10/15/2026
Comments
- …
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