postmark-email-best-practices

Use when asking about email deliverability, compliance (CAN-SPAM, GDPR, CASL), transactional email design patterns, list management, testing safely, or general email best practices — provider-agnostic knowledge with Postmark-specific guidance.

1.08x

Quality

73%

Does it follow best practices?

Impact

87%

1.08x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./postmark-email-best-practices/SKILL.md

Evaluation results

95%

Order Confirmation Email Service for a High-Traffic E-Commerce Platform

Reliable email sending with idempotency, retry, and batching

Criteria

Without context

With context

Idempotency key derivation

58%

100%

Pre-send idempotency check

100%

Post-send idempotency record

100%

Exponential backoff formula

100%

Retryable error codes

62%

100%

Non-retryable error codes

100%

Batch Send API for bulk

100%

58%

Concurrency rate limiting

25%

100%

Async queue pattern

100%

Correct message stream

100%

67%

12%

Email Testing Infrastructure for a SaaS Application

Safe email testing without harming sender reputation

Criteria

Without context

With context

No consumer provider addresses

100%

POSTMARK_API_TEST token usage

100%

Token via environment variable

70%

80%

Black hole address for functional tests

100%

Hard bounce testing address

Soft bounce or subscription testing address

Sandbox server for end-to-end testing

40%

Test method differentiation

50%

62%

Bounce webhook suppression verified

90%

100%

CI workflow environment setup

87%

100%

Newsletter Subscription and Unsubscribe System

Compliant newsletter subscription and unsubscribe flow

Criteria

Without context

With context

Stream separation: confirmation

100%

Stream separation: newsletter

100%

Double opt-in token expiry

100%

Consent timestamp recorded

100%

Consent source recorded

100%

List-Unsubscribe header

100%

List-Unsubscribe-Post header

100%

Physical postal address in footer

100%

Immediate unsubscribe suppression

100%

Own suppression list maintained

100%

No re-add without fresh consent

100%

No pre-ticked consent

100%

Repository: ActiveCampaign/postmark-skills
Commit: 73ea6bf

Evaluated: 6 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Order Confirmation Email Service for a High-Traffic E-Commerce Platform Email Testing Infrastructure for a SaaS Application Newsletter Subscription and Unsubscribe System

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