padosoft-email-html-builderlisted

Use this skill whenever the user creates, fixes, converts or reviews an HTML email (welcome, transactional, newsletter, DEM, ESP template) or asks to test it on Mailtrap or MailUp, even when they do not explicitly say "HTML", "template" or "deliverability": it produces table-based emails with minimal inline CSS, an aligned text/plain part, one-click List-Unsubscribe, and validates them with the included linter down to 0 errors, targeting SpamAssassin spam <= 0.1 and HTML Check with no warnings outside the baseline. Do not use it for copywriting without code, for configuring DNS/SPF/DKIM or for managing lists and bulk sends.
padosoft/skills · ★ 1 · Web & Frontend · score 80

Install: claude install-skill padosoft/skills

# Email HTML Builder Produces HTML emails that are **production ready on the first try**: table layout with HTML attributes, inline CSS reduced to typography alone, a minimal `<style>`, an aligned text/plain part, one-click unsubscribe headers. The expected result on Mailtrap is **spam ≤ 0.1** and an **HTML Check with only the allowed warnings** (§5). On MailUp Check-up: **zero problems**. The complete normative rules with `R-xxx` IDs are in `references/rules.md`. The linter is `scripts/lint_email.py` and the reference template is `templates/reference-welcome-dark.html`. **If those files are not available, the essential rules below are enough and are binding.** --- ## 0. Included scripts | Script | Use | |---|---| | `scripts/lint_email.py` | Rule validator. `python3 scripts/lint_email.py email.html --text email.txt --subject "Subject" [--production] [--transactional] [--json]`. Exit 1 if any MUST is violated, 0 when clean. | | `scripts/build_payload.py` | Generates the Mailtrap JSON payload with `List-Unsubscribe` and One-Click. `--help` for the options. | | `scripts/send_mailtrap_sandbox.sh` / `.ps1` | Sandbox send. Variables: `MAILTRAP_TOKEN`, `MAILTRAP_INBOX_ID`. | | `scripts/screenshot_email.py` | Screenshots at 600px and 375px, with and without `<style>` (requires Playwright; if it is missing, skip gate G2 and say so in the report). | | `templates/reference-welcome-dark.html` | Compliant template to start from (0 MUST violated). | | `references/rules.md` | Complete