design-email — Email Templates That Actually Get Read

Email is the one channel users check before they check your app. A well-crafted transactional email — clear, warm, fast-loading, and readable on any device — builds trust. A corporate, jargon-heavy, broken email erodes it. This skill handles the full stack: design, copy, deliverability.

Phase 0: Detect the stack

package.json        → @react-email/*, mjml, nodemailer, @sendgrid/mail,
                      resend, @aws-sdk/client-ses, postmark
emails/             → existing React Email templates
src/emails/         → email template directory
.env.*              → RESEND_API_KEY, SENDGRID_API_KEY, etc. (reference by name only)