Skills

Skill 2 of 5

Email Best Practices

Use when building email features, emails going to spam, high bounce rates, setting up SPF/DKIM/DMARC authentication, implementing email capture, ensuring compliance (CAN-SPAM…

1 minute · 159 words · 3 sections

Install

$ npx skills add resend/resend-skills --skill email-best-practices

$ npx skills add resend/resend-skills

» /plugin marketplace add resend/resend-skills

The first command installs just this skill, by the name in its SKILL.md; the second installs the whole repository.

Guidance for building deliverable, compliant, user-friendly emails.

Architecture Overview

[User] → [Email Form] → [Validation] → [Double Opt-In]
                                              ↓
                                    [Consent Recorded]
                                              ↓
[Suppression Check] ←──────────────[Ready to Send]
        ↓
[Idempotent Send + Retry] ──────→ [Email API]
                                       ↓
                              [Webhook Events]
                                       ↓
              ┌────────┬────────┬─────────────┐
              ↓        ↓        ↓             ↓
         Delivered  Bounced  Complained  Opened/Clicked
                       ↓        ↓
              [Suppression List Updated]
                       ↓
              [List Hygiene Jobs]

Quick Reference

Need to…	See
Set up SPF/DKIM/DMARC, fix spam issues	Deliverability (opens in a new tab)
Build password reset, OTP, confirmations	Transactional Emails (opens in a new tab)
Plan which emails your app needs	Transactional Email Catalog (opens in a new tab)
Build newsletter signup, validate emails	Email Capture (opens in a new tab)
Send newsletters, promotions	Marketing Emails (opens in a new tab)
Ensure CAN-SPAM/GDPR/CASL compliance	Compliance (opens in a new tab)
Decide transactional vs marketing	Email Types (opens in a new tab)
Handle retries, idempotency, errors	Sending Reliability (opens in a new tab)
Process delivery events, set up webhooks	Webhooks & Events (opens in a new tab)
Manage bounces, complaints, suppression	List Management (opens in a new tab)
Make emails accessible (screen readers, alt text, contrast)	Accessibility (opens in a new tab)

New app? Start with the Catalog (opens in a new tab) to plan which emails your app needs (password reset, verification, etc.), then set up Deliverability (opens in a new tab) (DNS authentication) before sending your first email.

Spam issues? Check Deliverability (opens in a new tab) first—authentication problems are the most common cause. Gmail/Yahoo reject unauthenticated emails.

Marketing emails? Follow this path: Email Capture (opens in a new tab) (collect consent) → Compliance (opens in a new tab) (legal requirements) → Marketing Emails (opens in a new tab) (best practices).

Production-ready sending? Add reliability: Sending Reliability (opens in a new tab) (retry + idempotency) → Webhooks & Events (opens in a new tab) (track delivery) → List Management (opens in a new tab) (handle bounces).

Accessibility? Most emails fail basic accessibility checks. See Accessibility (opens in a new tab) for lang/dir, presentational tables, headings, alt text, <title>, and contrast.

About this skill

Trigger

Use when building email features, emails going to spam, high bounce rates, setting up SPF/DKIM/DMARC authentication, implementing email capture, ensuring compliance (CAN-SPAM, GDPR, CASL), handling webhooks, retry logic, making emails accessible (alt text, headings, contrast, screen readers), or deciding transactional vs marketing.

The verbatim description from this skill’s front matter — the string an agent matches on to decide whether to load it.

Licence: MIT
Source: skills/email-best-practices/SKILL.md

Colophon for this issue

Colophon

How this issue was made

Source

github.com/resend/resend-skills, branch main, last pushed 18 September 2026.

Licence

MIT — the text of every skill is reproduced unmodified, frontmatter included, under the upstream licence.

Discovery

5 skills found by walking the repository tree for SKILL.md, not by matching a directory convention. One layout observed: skills/*/SKILL.md.

Issue colours

Resolved from the owner’s published design.md — hue 21°, chroma 0.190. Two accent tones are generated per issue and each is proven against its own ground before it ships: a single accent that passes AA on both light and dark paper is arithmetically impossible.

Typefaces

Display: Domaine Display Narrow is not available to us; set in Fraunces.
Mono: CommitMono is not available to us; set in JetBrains Mono.

We never load a typeface at request time from a third-party origin, so a brand face we do not already self-host is substituted rather than fetched.

Heading repairs

1 repair applied to this skill so the document has one h1 and no skipped levels:

Removed “Email Best Practices”, a leading h1 that duplicated the skill title.

Spec compliance

Every skill satisfies the Agent Skills specification’s frontmatter rules.

Images

Images inside a skill come from the upstream repository. Where the author gave no alternative text we mark the image decorative rather than inventing a description — a plausible caption we made up is worse than none for the reader who depends on it.

Marketplace

A plugin manifest is published at .claude-plugin/marketplace.json by Resend, declaring 1 plugin. It is read for editorial metadata only — never as the skill index, which is always the repository tree.

Signal

Install counts come from skills.sh. They measure downloads, not quality, and an unranked repository is not an unread one.

Agent surfaces

The whole issue is available as one markdown document at /resend/resend-skills.md, and each skill at its own .md URL.

Publication

Set by Skills Docs from the source repository. Body text is Literata at the reader’s chosen size and measure; code is Geist Mono. Nothing on this page was written by us except this paragraph.

Architecture Overview

[User] → [Email Form] → [Validation] → [Double Opt-In]
                                              ↓
                                    [Consent Recorded]
                                              ↓
[Suppression Check] ←──────────────[Ready to Send]
        ↓
[Idempotent Send + Retry] ──────→ [Email API]
                                       ↓
                              [Webhook Events]
                                       ↓
              ┌────────┬────────┬─────────────┐
              ↓        ↓        ↓             ↓
         Delivered  Bounced  Complained  Opened/Clicked
                       ↓        ↓
              [Suppression List Updated]
                       ↓
              [List Hygiene Jobs]

Need to…

See

Set up SPF/DKIM/DMARC, fix spam issues

Deliverability

Build password reset, OTP, confirmations

Transactional Emails

Plan which emails your app needs

Transactional Email Catalog

Build newsletter signup, validate emails

Email Capture

Send newsletters, promotions

Marketing Emails

Ensure CAN-SPAM/GDPR/CASL compliance

Compliance

Decide transactional vs marketing

Email Types

Handle retries, idempotency, errors

Sending Reliability

Process delivery events, set up webhooks

Webhooks & Events

Manage bounces, complaints, suppression

List Management

Make emails accessible (screen readers, alt text, contrast)

Accessibility

Start Here

New app? Start with the Catalog to plan which emails your app needs (password reset, verification, etc.), then set up Deliverability (DNS authentication) before sending your first email.

Spam issues? Check Deliverability first—authentication problems are the most common cause. Gmail/Yahoo reject unauthenticated emails.

Accessibility? Most emails fail basic accessibility checks. See Accessibility for lang/dir, presentational tables, headings, alt text, <title>, and contrast.

Email Best Practices

Architecture Overview

Quick Reference

Start Here

About this skill

Trigger

Colophon

Email Best Practices

Architecture Overview

Quick Reference

Start Here

Appendix 2.1–2.11

ReferencesMarkdown · 11 files

About this skill

Trigger

Colophon

Appendix 2.1–2.11

ReferencesMarkdown · 11 files