New: 98,000+ skills indexed from GitHub repos with 100+ stars · every skill safety-checkedBrowse top skillsTop skills
Esc to closeBrowse all skills
Submit a skillBrowse skills
Submit a skillBrowse skills

Agent skill

Mailtrap Setting Up Sending Domain

by sickn33 in sickn33/agentic-awesome-skills

Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance.

MITAuto-check passed

Install Mailtrap Setting Up Sending Domain

skills CLI
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-setting-up-sending-domain -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install sickn33/agentic-awesome-skills mailtrap-setting-up-sending-domain --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/mailtrap-setting-up-sending-domain .claude/skills/mailtrap-setting-up-sending-domain && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
mailtrap-setting-up-sending-domain
GitHub stars
47k
Used in
1 other repo
Token cost
~1.3k tokens
SKILL.md length
542 words
Files
1
Skills in repo
1,497
Repo updated
First seen
Licence
MIT

At a glance

Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance.

  • Works in 3 steps: DNS records and status via API — Use the… → Create domain via API — → Publish DNS programmatically —
  • SKILL.md covers Overview, When to use, When not to use and Authorization, plus 6 more sections
  • Reaches mailtrap.io; needs MAILTRAP_API_TOKEN

What it does

Mailtrap Setting Up Sending Domain is an agent skill from sickn33/agentic-awesome-skills. Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Cloudflare. The repository describes itself as: AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,400+ agentic skills. Includes… The licence is MIT.

Example prompts

  • “/mailtrap-setting-up-sending-domain”

Requirements

  • A credential in MAILTRAP_API_TOKEN

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. DNS records and status via API — Use the Sending Domains API
  2. Create domain via API —
  3. Publish DNS programmatically —

What it can do on your machine

Read from SKILL.md and the folder at commit b84d35a. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • mailtrap.io

    Also links to:

    • docs.mailtrap.io
    • developers.cloudflare.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • MAILTRAP_API_TOKEN

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mailtrap Setting Up Sending Domain loads about 1.3k tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 542 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~41
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from sickn33/agentic-awesome-skills at commit b84d35a, republished under its MIT licence (© sickn33). 542 words, ~1,291 tokens.

Download SKILL.mdSave it as .claude/skills/mailtrap-setting-up-sending-domain/SKILL.md (or your agent's skills folder).
name
mailtrap-setting-up-sending-domain
description
Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance.
risk
critical
source
community
date_added
2026-06-19

Setting up a Mailtrap sending domain

Overview

You must add and verify a domain you control before live sending. Mailtrap shows every DNS record required for that domain in the UI: add the complete set as given (do not cherry-pick). After DNS verifies, complete the compliance step if requested.

Subdomain vs root: add the exact hostname you will use in the From address. If you send from notifications.mycompany.com, add that subdomain as the sending domain—not only mycompany.com, unless you truly send from the root domain.

For step-by-step clicks at common hosts, open the matching guide on Sending domain setup (Cloudflare, Route 53, etc.) and follow it alongside the live UI values.

Related skills: mailtrap-sending-emails (after domain is ready).

When to use

  • New Sending Domains setup, stuck verification, or compliance questions
  • DNS at Cloudflare, AWS, Google, Namecheap, GoDaddy, DigitalOcean, etc.

When not to use

  • Sandbox-only testing without a custom domain (see mailtrap-testing-with-sandbox)

Authorization

The Sending Domains API calls below need Authorization: Bearer $MAILTRAP_API_TOKEN and an $MAILTRAP_ACCOUNT_ID in the path. Resolve $MAILTRAP_ACCOUNT_ID from GET https://mailtrap.io/api/accounts, and store tokens in environment variables or a secrets manager.

Automating setup (API and DNS providers)

Prefer this path when building scripts or AI-assisted automation:

  1. DNS records and status via API — Use the Sending Domains API:
  • GET https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/sending_domains — lists domains
  • GET https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/sending_domains/{sending_domain_id} — returns dns_records (each with type, name, value, and verification status) and dns_verified. Poll after you publish DNS.
  1. Create domain via API —
  • POST https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/sending_domains with domain_name when your flow provisions domains programmatically.
  1. Publish DNS programmatically —
  • Create the returned records at your DNS host using their API (e.g., Cloudflare API, AWS Route 53, Google Cloud DNS) or IaC. Align record names and values exactly with the API response.

Human fallback: Sending Domains > Add domain > copy values into the registrar UI > Verify when API automation is not available.

Show full SKILL.md (239 more words)Show less

Workflow (summary)

  1. Sending Domains > Add domain and enter the domain name.
  2. Obtain required records from the UI or Sending Domains API; create all listed records at your DNS host exactly as shown (names, types, values).
  3. Wait for DNS propagation. If verification stays pending, use dig, nslookup, or an online DNS lookup to confirm each record is visible publicly before clicking Verify again.
  4. Complete the compliance flow when prompted.

Product walkthrough: Sending domain setup.

DNS provider guides (documentation)

Mailtrap publishes click-path guides for common providers. Open the page that matches the user's DNS host and follow it together with the live UI records:

If the user's provider is not listed, the same rule applies: copy every record from Mailtrap into the DNS zone that serves the From domain.

Important DNS caveat (proxied DNS)

If your DNS provider proxies records (orange-cloud on Cloudflare, similar CDN/proxy modes elsewhere), verification-related records must be DNS-only (grey cloud / non-proxied) unless Mailtrap documentation explicitly allows proxying—proxied CNAMEs and similar often break SPF/DKIM verification. The same constraint applies to any host that fronts DNS with a proxy.

Example

User request:

Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance.

Limitations

  • DNS and compliance screens can change; always copy the exact current records from Mailtrap before publishing DNS.

© sickn33, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/mailtrap-setting-up-sending-domain of sickn33/agentic-awesome-skills.

Open the folder on GitHubat commit b84d35a

Used in 1 other repository

We found 5 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Mailtrap Setting Up Sending Domain next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Mailtrap Setting Up Sending Domain compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Mailtrap Setting Up Sending Domain this skillsickn33/agentic-awesome-skills47k1 repos~1.3kAutomated safety check: PassMIT
Cloudflare Browser Renderingcloudflare/moltworker9.9k—~742Automated safety check: PassApache-2.0
Turnstile Spincloudflare/skills3k4 repos~7.2kAutomated safety check: NotesApache-2.0
Star Office UI Setupringhyacinth/Star-Office-UI7.5k—~1.3kAutomated safety check: PassMIT
Cloudflarehodgef/apiker1277 repos~2.2kAutomated safety check: PassMIT
Webhome Extension Builderwebhtv/webhtv1.7k—~2.8kAutomated safety check: PassGPL-3.0

Similar skills

  • Cloudflare Browser Rendering

    cloudflare/moltworker

    Official

    Drives headless Chrome through Cloudflare Browser Rendering over a CDP WebSocket to take screenshots, navigate and scrape pages, and record multi-page videos.

    9.9k GitHub stars~742 tokensUpdated 5 mo ago
    Productivity & AutomationAuto-check passed

  • Turnstile Spin

    cloudflare/skills

    Official

    Set up, repair, or migrate to Cloudflare Turnstile bot verification in an existing frontend and backend, including server-side Siteverify.

    3k GitHub starsUsed in 4 repos~7.2k tokens
    Frontend & DesignAuto-check: notes

  • Star Office UI Setup

    ringhyacinth/Star-Office-UI

    Sets up Star Office UI, a pixel-art office dashboard that shows AI agent states, lets other agents join and can be opened from a phone or a public link.

    7.5k GitHub stars~1.3k tokensUpdated 7 mo ago
    Agent WorkflowsAuto-check passed

  • Cloudflare

    hodgef/apiker

    Comprehensive Cloudflare platform skill covering Workers, Pages, storage (KV, D1, R2), AI (Workers AI, Vectorize, Agents SDK), feature flags (Flagship), networking (Tunnel, Spectrum), security (WAF…

    127 GitHub starsUsed in 7 repos~2.2k tokens
    DevOps & CloudAuto-check passed

  • Webhome Extension Builder

    webhtv/webhtv

    Build, review, debug, reverse-engineer, and package WebHome injected extension scripts for FongMi/WebHome App WebView pages.

    1.7k GitHub stars~2.8k tokensUpdated 2 days ago
    SecurityAuto-check passed

  • Nextjs On Cloudflare

    cloudflare/skills

    Official

    Build, migrate, and deploy Next.js apps on Cloudflare Workers with vinext.

    3k GitHub starsUsed in 2 repos~678 tokens
    DevOps & CloudAuto-check passed

More from sickn33/agentic-awesome-skills

All 1,497 skills in this repo

  • Liuguang Banlan UI

    sickn33/agentic-awesome-skills

    Implements an interface in one of two named color modes, iridescent white or colorful black, from a parameterized starter that reports measured color intensity.

    47k GitHub starsUsed in 1 repo~2.5k tokens
    Auto-check passed

  • User Thoughts Memory

    sickn33/agentic-awesome-skills

    Saves a user's project decisions, rules and preferences into a project-local mdbase so later sessions and other agents can recover the intent.

    47k GitHub starsUsed in 1 repo~2.5k tokens
    Auto-check passed

  • Using LWC Memory and Graphs

    sickn33/agentic-awesome-skills

    Keeps project decisions, research and verified results available across coding-agent sessions through LWC memory, a document Wiki graph and a CodeGraph code index.

    47k GitHub starsUsed in 1 repo~2k tokens
    Auto-check passed

  • Find Complementary Founders

    sickn33/agentic-awesome-skills

    Guides an agent through assessing its own owner for cofounder fit, publishing an approved profile, and ranking complementary profiles other agents published for their owners.

    47k GitHub starsUsed in 1 repo~4.8k tokens
    Auto-check passed

  • Whatsapp Cloud API

    sickn33/agentic-awesome-skills

    Integracao com WhatsApp Business Cloud API (Meta). An agent skill from sickn33/agentic-awesome-skills.

    47k GitHub starsUsed in 2 repos~4.5k tokens
    Auto-check passed

  • Cline Pilot

    sickn33/agentic-awesome-skills

    Acts as a proxy for the Cline CLI, dispatching coding tasks one at a time, monitoring runs by hard evidence, relaying decisions to you and learning per-project preferences.

    47k GitHub starsUsed in 1 repo~4.6k tokens
    Auto-check passed

Works with

Questions about Mailtrap Setting Up Sending Domain

What does Mailtrap Setting Up Sending Domain do?

Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance. Mailtrap Setting Up Sending Domain is an agent skill from sickn33/agentic-awesome-skills. Add or verify a Mailtrap sending domain, troubleshoot DNS propagation, publish SPF/DKIM/DMARC records, and complete compliance.

How do I install Mailtrap Setting Up Sending Domain in Claude Code?

Run `npx skills add sickn33/agentic-awesome-skills --skill mailtrap-setting-up-sending-domain -a claude-code`. Or copy the skill folder (skills/mailtrap-setting-up-sending-domain in sickn33/agentic-awesome-skills) into .claude/skills/mailtrap-setting-up-sending-domain in your project. Claude Code loads it when a task matches its description.

How do I install Mailtrap Setting Up Sending Domain in Codex?

Run `npx skills add sickn33/agentic-awesome-skills --skill mailtrap-setting-up-sending-domain -a codex`. Or copy the skill folder (skills/mailtrap-setting-up-sending-domain in sickn33/agentic-awesome-skills) into .agents/skills/mailtrap-setting-up-sending-domain in your project. Codex loads it when a task matches its description.

Can I use Mailtrap Setting Up Sending Domain in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add sickn33/agentic-awesome-skills --skill mailtrap-setting-up-sending-domain -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mailtrap-setting-up-sending-domain, .gemini/skills/mailtrap-setting-up-sending-domain, .github/skills/mailtrap-setting-up-sending-domain and .opencode/skills/mailtrap-setting-up-sending-domain in your project.

What does Mailtrap Setting Up Sending Domain need to run?

Going by SKILL.md and its folder, Mailtrap Setting Up Sending Domain needs credentials named MAILTRAP_API_TOKEN. Our summary lists: A credential in MAILTRAP_API_TOKEN.

Does Mailtrap Setting Up Sending Domain access the network?

SKILL.md names 3 domains. In commands or code: mailtrap.io; the agent is likely to contact it when it follows the instructions. As links in the text: docs.mailtrap.io and developers.cloudflare.com. This is read from the text; nothing was executed.

Is Mailtrap Setting Up Sending Domain safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Mailtrap Setting Up Sending Domain use?

Mailtrap Setting Up Sending Domain is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mailtrap Setting Up Sending Domain use?

About 1.3k tokens (SKILL.md is roughly 5.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Mailtrap Setting Up Sending Domain?

Skills that share tags, products or a category with Mailtrap Setting Up Sending Domain: Cloudflare Browser Rendering (cloudflare/moltworker, 9.9k stars), Turnstile Spin (cloudflare/skills, 3k stars), Star Office UI Setup (ringhyacinth/Star-Office-UI, 7.5k stars) and Cloudflare (hodgef/apiker, 127 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mailtrap Setting Up Sending Domain?

sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,405 GitHub stars. The repository holds 1,497 skills in this directory. The repository was last updated on October 9, 2026.

Source: sickn33/agentic-awesome-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.