Gmail Email
open-gitagent/gitagent
Send emails via Gmail SMTP using App Password authentication.
Capture outbound email in Mailtrap Email Sandbox for development, staging, CI, HTML inspection, spam checks, and fake inbox tests.
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sickn33/agentic-awesome-skills mailtrap-testing-with-sandbox --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/mailtrap-testing-with-sandbox .claude/skills/mailtrap-testing-with-sandbox && rm -rf skills-srcUse ~/.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/
Install the "mailtrap-testing-with-sandbox" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandbox into .claude/skills/mailtrap-testing-with-sandbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailtrap-testing-with-sandbox", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandboxType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sickn33/agentic-awesome-skills mailtrap-testing-with-sandbox --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/mailtrap-testing-with-sandbox .agents/skills/mailtrap-testing-with-sandbox && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mailtrap-testing-with-sandbox" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandbox into .agents/skills/mailtrap-testing-with-sandbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailtrap-testing-with-sandbox", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sickn33/agentic-awesome-skills mailtrap-testing-with-sandbox --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/mailtrap-testing-with-sandbox .cursor/skills/mailtrap-testing-with-sandbox && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mailtrap-testing-with-sandbox" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandbox into .cursor/skills/mailtrap-testing-with-sandbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailtrap-testing-with-sandbox", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/sickn33/agentic-awesome-skills.git --path skills/mailtrap-testing-with-sandbox--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sickn33/agentic-awesome-skills mailtrap-testing-with-sandbox --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/mailtrap-testing-with-sandbox .gemini/skills/mailtrap-testing-with-sandbox && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "mailtrap-testing-with-sandbox" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandbox into .gemini/skills/mailtrap-testing-with-sandbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailtrap-testing-with-sandbox", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install sickn33/agentic-awesome-skills mailtrap-testing-with-sandboxInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/mailtrap-testing-with-sandbox .github/skills/mailtrap-testing-with-sandbox && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "mailtrap-testing-with-sandbox" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandbox into .github/skills/mailtrap-testing-with-sandbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailtrap-testing-with-sandbox", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sickn33/agentic-awesome-skills mailtrap-testing-with-sandbox --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/mailtrap-testing-with-sandbox .opencode/skills/mailtrap-testing-with-sandbox && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mailtrap-testing-with-sandbox" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/mailtrap-testing-with-sandbox into .opencode/skills/mailtrap-testing-with-sandbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailtrap-testing-with-sandbox", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
mailtrap-testing-with-sandboxCapture outbound email in Mailtrap Email Sandbox for development, staging, CI, HTML inspection, spam checks, and fake inbox tests.
Mailtrap Testing With Sandbox is an agent skill from sickn33/agentic-awesome-skills. Capture outbound email in Mailtrap Email Sandbox for development, staging, CI, HTML inspection, spam checks, and fake inbox tests.
Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Productivity & Automation, covering Email management and Transactional email. 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.
Read from SKILL.md and the folder at commit 680176d. It shows what the files ask for, not the result of running them.
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.
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.
Hosts in commands or code, which the agent is likely to contact:
mailtrap.iosandbox.api.mailtrap.ioAlso links to:
docs.mailtrap.iogithub.comFrom URLs in SKILL.md, links to its own repository left out.
Names these keys or tokens, usually read from environment variables:
MAILTRAP_SANDBOX_API_TOKENMAILTRAP_API_TOKENFrom names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Mailtrap Testing With Sandbox loads about 1.9k tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 678 words of instructions outside code blocks.
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.
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.
The full file from sickn33/agentic-awesome-skills at commit 680176d, republished under its MIT licence (© sickn33). 678 words, ~1,937 tokens.
.claude/skills/mailtrap-testing-with-sandbox/SKILL.md (or your agent's skills folder).Email Sandbox captures mail in sandboxes (test inboxes)—a test environment where messages are not delivered to real recipients. You can send to sandboxes using our SDKs, HTTP API, or SMTP, depending on your needs.
Before generating SDK code: read the README of the relevant SDK repository (see mailtrap-sending-emails) for current sandbox mode options, inbox id, and constructor flags. Do not rely on memory.
Related skills: mailtrap-sending-emails (live sending hosts and streams).
mailtrap-sending-emails).| Service | Send mail URL | Auth header examples |
|---|---|---|
| Email Testing API (REST) | https://sandbox.api.mailtrap.io/api/send/{inbox_id} | Authorization: Bearer $MAILTRAP_SANDBOX_API_TOKEN |
Sandbox uses a separate token ($MAILTRAP_SANDBOX_API_TOKEN, Testing/Sandbox scope) — never reuse the live $MAILTRAP_API_TOKEN. The account_id in the example endpoints below is resolved at runtime via GET https://mailtrap.io/api/accounts. Store tokens in environment variables or a secrets manager.
Use SMTP when testing apps that already send mail via SMTP (just update the host, port, and credentials). Use the HTTP API when building new integrations or your app can make HTTP requests; it's better for programmatic testing and automation.
| Setting | Value |
|---|---|
| Host | sandbox.smtp.mailtrap.io |
| Ports | 2525 (default), 25, 465 (SSL), 587 |
| Username / Password | Per sandbox credentials from the Integration tab in the Mailtrap UI |
Never use sandbox credentials or endpoints in production. Messages will only be captured in the sandbox, not delivered.
sandbox.api.mailtrap.io / sandbox.smtp.mailtrap.io with a valid inbox id.Use API docs for details, but typical endpoints include:
| Operation | URL | Reference |
|---|---|---|
| List sandboxes | GET https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/inboxes | Sandboxes API |
| List messages | GET https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/inboxes/{inbox_id}/messages | Messages |
| Fetch a message | GET https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/inboxes/{inbox_id}/messages/{id} | Message details |
| Send test email | POST https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/inboxes/{inbox_id}/messages | Send test emails |
For template testing, see the Integration tab of your template and Handlebars.
Official Mailtrap SDKs support sandbox/inbox operations and provide flags or methods to set test mode and inbox id. This allows you to use the same integration for both live sending and sandbox testing—simply change the mode or credentials depending on your environment (development, staging, or production). For install commands and language coverage, see Mailtrap developer documentation. Repository READMEs have the latest sandbox options:
| Mistake | Fix/Explanation |
|---|---|
| Expecting real delivery from sandbox | Mail in the sandbox is never delivered to recipients |
| Using production API token for sandbox | Use a token with proper sandbox/testing scope, granting access to the target inbox |
| Forgetting inbox id parameter | Always supply the inbox id (from UI or Integration tab) to associate messages with the correct inbox |
| Mixing sandbox and transactional endpoints | Testing API (sandbox.api.mailtrap.io) is not the same as send.api.mailtrap.io (live sending)! |
Each sandbox (test inbox) has an address like alias@inbox.mailtrap.io for inbound tests; plus-addressing can help isolate scenarios. See Email address per sandbox for limits and behavior.
© sickn33, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Just SKILL.md in skills/mailtrap-testing-with-sandbox of sickn33/agentic-awesome-skills.
Open the folder on GitHubat commit 680176d
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.
Mailtrap Testing With Sandbox 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Mailtrap Testing With Sandbox this skillsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Gmail Emailopen-gitagent/gitagent | 713 | — | ~235 | Automated safety check: Notes | MIT | |
| Tethertokencanopy/e2a | 193 | — | ~4.7k | Automated safety check: Pass | Apache-2.0 | |
| E2atokencanopy/e2a | 193 | — | ~4.7k | Automated safety check: Pass | Apache-2.0 | |
| Inbox Placement Monitoraaron-he-zhu/aaron-marketing-skills | 2.9k | 2 repos | ~3.6k | Automated safety check: Pass | Apache-2.0 | |
| Email Deliverability Auditgrowthenginenowoslawski/coldoutboundskills | 751 | — | ~3.4k | Automated safety check: Pass | MIT |
open-gitagent/gitagent
Send emails via Gmail SMTP using App Password authentication.
tokencanopy/e2a
Beta — Stay in the loop over email during a long-running coding session.
tokencanopy/e2a
A skill your agent uses when operating an already-connected e2a inbox over MCP: reading, composing, sending, replying, forwarding, handling attachments, managing contacts/outreach, scheduling mail…
aaron-he-zhu/aaron-marketing-skills
A skill your agent uses when the user asks to "track where my emails are actually landing after I send", "read my seed-list inbox vs spam vs promotions results", "trend my Gmail Postmaster /…
growthenginenowoslawski/coldoutboundskills
Diagnostic audit for a running cold email program. An agent skill from growthenginenowoslawski/coldoutboundskills.
Prismer-AI/PrismerCloud
Operates a mailbox from the terminal with the external Himalaya CLI over IMAP, SMTP, Notmuch or Sendmail, separate from any built-in email gateway adapter.
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.
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.
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.
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.
sickn33/agentic-awesome-skills
Integracao com WhatsApp Business Cloud API (Meta). An agent skill from sickn33/agentic-awesome-skills.
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.
Categories
Capture outbound email in Mailtrap Email Sandbox for development, staging, CI, HTML inspection, spam checks, and fake inbox tests. Mailtrap Testing With Sandbox is an agent skill from sickn33/agentic-awesome-skills. Capture outbound email in Mailtrap Email Sandbox for development, staging, CI, HTML inspection, spam checks, and fake inbox tests.
Mailtrap Testing With Sandbox fits situations like: tasks that involve Email management; tasks that involve Transactional email.
Run `npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a claude-code`. Or copy the skill folder (skills/mailtrap-testing-with-sandbox in sickn33/agentic-awesome-skills) into .claude/skills/mailtrap-testing-with-sandbox in your project. Claude Code loads it when a task matches its description.
Run `npx skills add sickn33/agentic-awesome-skills --skill mailtrap-testing-with-sandbox -a codex`. Or copy the skill folder (skills/mailtrap-testing-with-sandbox in sickn33/agentic-awesome-skills) into .agents/skills/mailtrap-testing-with-sandbox in your project. Codex loads it when a task matches its description.
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-testing-with-sandbox -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-testing-with-sandbox, .gemini/skills/mailtrap-testing-with-sandbox, .github/skills/mailtrap-testing-with-sandbox and .opencode/skills/mailtrap-testing-with-sandbox in your project.
Going by SKILL.md and its folder, Mailtrap Testing With Sandbox needs credentials named MAILTRAP_SANDBOX_API_TOKEN and MAILTRAP_API_TOKEN. Our summary lists: Node.js; A credential in MAILTRAP_SANDBOX_API_TOKEN; A credential in MAILTRAP_API_TOKEN.
SKILL.md names 4 domains. In commands or code: mailtrap.io and sandbox.api.mailtrap.io; the agent is likely to contact these when it follows the instructions. As links in the text: docs.mailtrap.io and github.com. This is read from the text; nothing was executed.
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.
Mailtrap Testing With Sandbox is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
About 1.9k tokens (SKILL.md is roughly 7.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Mailtrap Testing With Sandbox: Gmail Email (open-gitagent/gitagent, 713 stars), Tether (tokencanopy/e2a, 193 stars), E2a (tokencanopy/e2a, 193 stars) and Inbox Placement Monitor (aaron-he-zhu/aaron-marketing-skills, 2.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,379 GitHub stars. The repository holds 1,493 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.