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sandeepmvl
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actionmailer-baseline

Configure async ActionMailer delivery with bounce handling for Rails 8 applications.

21|2|Updated May 24, 2026
Search Tags:#rails#actionmailer#transactional email#email delivery#bounce handling#deliver_later#mailer specs
One-click install
npx skills add https://github.com/sandeepmvl/rails-skills --skill actionmailer-baseline
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: actionmailer-baseline
Source: https://github.com/sandeepmvl/rails-skills/tree/main/skills/14-actionmailer-baseline
Command: npx skills add https://github.com/sandeepmvl/rails-skills --skill actionmailer-baseline

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

AI coding agents frequently implement ActionMailer incorrectly for Rails applications, leading to blocked request threads from synchronous email sends, duplicate emails on job retries, poor sender reputation from unhandled bounces, and broken email templates that fail spam checks. This skill provides senior Rails developer-approved patterns to eliminate these common production failures.

Core Features & Use Cases

  • Async Default Delivery: Enforces deliver_later for all user-facing request paths to avoid blocking user responses, with clear guidance on when synchronous deliver_now is appropriate.
  • Production Vendor Integration: Pre-configured setup for Postmark, SendGrid, AWS SES, and Mailgun with decision matrices to match your app's scale and compliance needs.
  • Bounce & Complaint Handling: Webhook routing and mailer interceptor patterns to suppress sends to undeliverable addresses and protect your domain's sender reputation.
  • Idempotent Transactional Sends: Guard patterns to prevent duplicate password reset and welcome emails on job retries, using sent-at tracking columns.
  • Development Tooling: Mailer previews and Letter Opener configuration to inspect rendered emails locally without sending real messages.
  • Test Coverage: RSpec patterns for mailer specs, job specs, and request specs using have_enqueued_mail matchers to validate email behavior.
  • i18n Support: Locale-aware subject and body rendering for multi-language user bases. Use case: A SaaS app sending password reset emails can use this skill to implement async delivery, bounce handling, and idempotent tokens to avoid duplicate resets and maintain deliverability.

Quick Start

Use the actionmailer-baseline skill to configure async transactional email delivery with bounce handling and mailer previews for your Rails 8 application.

Frequently Asked Questions about actionmailer-baseline

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I prevent duplicate transactional emails in Rails when background jobs retry?▼

To prevent duplicate transactional emails in Rails during job retries, implement idempotent send guards using sent-at tracking columns. This ensures password reset and welcome emails only dispatch once, protecting sender reputation and avoiding redundant deliveries.

Why do synchronous email sends block request threads in Rails and how do I fix it?▼

Synchronous email sends block Rails request threads by waiting for the mail server to respond. Fix this by enforcing default deliver_later usage for all user-facing request paths, which offloads delivery to a background job and frees the thread.

What's the best way to handle email bounces and complaints in Rails 8 ActionMailer?▼

Handle email bounces and complaints in Rails 8 by configuring webhook routing and mailer interceptor patterns. This suppresses sends to undeliverable addresses and protects your domain's sender reputation from being damaged by failed deliveries.

How do I configure ActionMailer for production vendor integration with Postmark, SendGrid, AWS SES, or Mailgun?▼

Configure ActionMailer for production vendor integration using pre-configured setups for Postmark, SendGrid, AWS SES, and Mailgun. Decision matrices match your app's scale and compliance needs to the appropriate transactional email provider.

How do I test ActionMailer mailer specs and job specs in RSpec using have_enqueued_mail?▼

Test ActionMailer behavior in RSpec by using have_enqueued_mail matchers for mailer specs, job specs, and request specs. This validates email delivery expectations and ensures your transactional email workflows function correctly.

Does Rails 8 ActionMailer support i18n locale-aware email subjects and bodies for multi-language apps?▼

Yes, Rails 8 ActionMailer supports i18n locale-aware subject and body rendering for multi-language user bases. This allows transactional emails to automatically render in the recipient's preferred locale.

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