Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add mailtrap/mailtrap-skills --skill sending-emailsgit clone --depth 1 https://github.com/mailtrap/mailtrap-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mailtrap/mailtrap-skills/sending-emails)<a href="https://agentmods.dev/skills/mailtrap/mailtrap-skills/sending-emails"><img src="https://agentmods.dev/badge/skills/mailtrap/mailtrap-skills/sending-emails/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mailtrap/mailtrap-skills/sending-emails"><img src="https://agentmods.dev/badge/skills/mailtrap/mailtrap-skills/sending-emails.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00037 | $0.02185 |
| Opus 5 | $0.00018 | $0.01092 |
| Sonnet 5 | $0.00007 | $0.00437 |
| Haiku 4.5 | $0.00004 | $0.00218 |
Grade A, and why
sending-emails scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
### Examples (`curl`) How it starts
The opening of the file, as written. The whole thing — 159 lines — stays where its author put it; the contents beside it link to each section on 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).
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. |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 159 lines · 37 tokens per session scan A 683c0390b9f8
sending-emails is a skill published in the GitHub repository mailtrap/mailtrap-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 37 tokens to every session and 2,185 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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