Sales Fastmail

Q: What is a Claude Code skill and how does the Sales Fastmail skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Sales Fastmail is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Sales category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Sales · Sub-category: sales-misc · Last updated: 2026-05-21

lang:python type:integration

Fastmail platform help — independent privacy-respecting email with full JMAP API, custom domains, Masked Email aliases, calendar/contacts/files, OAuth 2.0, IMAP/SMTP/CardDAV/CalDAV/WebDAV, CORS-enabled, community MCP server (Individual ~$5/mo / Business Standard ~$5/user/mo, 20+ years independent, no ads). Use when setting up Fastmail with a custom domain for your business, JMAP API calls failing or session auth not working, building automations against the Fastmail JMAP API with Python or JavaScript, Masked Email aliases not creating or hitting rate limits, comparing Fastmail to Proton Mail or Gmail or Hey for solopreneur email, migrating from Gmail or Outlook to Fastmail, Fastmail calendar not syncing with Google Calendar, connecting the Fastmail MCP server to Claude Desktop, choosing between Fastmail Individual and Business plans, or wondering why Fastmail has no native Zapier or Make integration. Do NOT use for AI email drafting or smart inbox triage (use /sales-superhuman or /sales-shortwave). Do NOT use for team shared inbox with ticketing (use /sales-hiver or /sales-missive). Do NOT use for end-to-end encrypted email (use /sales-proton-mail).

About this skill (catalog notes)

Sales Fastmail includes worked examples; pricing or quota commentary. The SKILL.md runs to about 1,459 words, in the catalog's typical mid-range.

License: MIT
Indexed lastmod: 2026-05-21
Catalog position: Sales · sales-misc
Indexed related skills: 10

How Sales Fastmail fits the catalog

Sales Fastmail sits in the Sales category under the sales-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Helps with everything related to using Fastmail — the independent, privacy-respecting email service with a full JMAP API, custom domains, Masked Email aliases, and integrated calendar/contacts/files. 20+ years independent, no ads, standards-first.

What this skill does

Sales Fastmail is a community-contributed Claude Code skill in the sales-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/sales-fastmail/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when setting up Fastmail with a custom domain for your business, JMAP API calls failing or session auth not working, building automations against the Fastmail JMAP API with Python or JavaScript, Masked Email aliases not creating or hitting rate limits, comparing Fastmail to Proton Mail or Gmail or Hey for solopreneur email, migrating from Gmail or Outlook to Fastmail, Fastmail calendar not syncing with Google Calendar, connecting the Fastmail MCP server to Claude Desktop, choosing between Fastmail Individual and Business plans, or wondering why Fastmail has no native Zapier or Make integration. Do NOT use for AI email drafting or smart inbox triage (use /sales-superhuman or /sales-shortwave).

Who uses this skill

The Sales Fastmail Claude Code skill is built for sales development reps, account executives, revenue operations teams, and customer success managers. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 122,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/sales-fastmail
curl -L https://claudskills.com/skills/sales-fastmail/SKILL.md \
  -o ~/.claude/skills/sales-fastmail/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/sales-fastmail/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/sales-fastmail/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\sales-fastmail\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Sales Fastmail Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/sales-fastmail/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Sales Fastmail skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Sales Fastmail skill?

Use Sales Fastmail when your Claude Code task falls under the Sales category — specifically in the sales misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Sales Fastmail" or describe the task and let Claude pick). Browse related skills at /category/sales/.

What is a Claude Code skill and how does the Sales Fastmail skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Sales Fastmail is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Sales category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

License: MIT

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

ClaudSkills. (2026). Sales Fastmail [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/sales-fastmail/

BibTeX

@misc{sales-fastmail-2026,
  author    = {ClaudSkills},
  title     = {Sales Fastmail [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/sales-fastmail/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/sales-fastmail.svg)](https://claudskills.com/skills/sales-fastmail/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

More Sales skills

Browse all Sales skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Sales skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore