EmailDomainChecker

Email address validation and domain checking library to prevent mail server reputation degradation.

Features

• ✅ Email format validation
• ✅ Domain existence validation
• ✅ MX record checking
• ✅ A record checking
• ✅ Email normalization
• ✅ Domain blacklist/whitelist
• ✅ Custom domain checker
• ✅ ActiveModel/ActiveRecord integration
• ✅ DNS result caching (memory and Redis)
• ✅ Test mode for development

Quick Example

require 'email_domain_checker'

# Quick validation
EmailDomainChecker.valid?("user@example.com", validate_domain: false) # => true

# Domain validation with MX records
EmailDomainChecker.domain_valid?("user@example.com", check_mx: true) # => true/false

# Normalize email
EmailDomainChecker.normalize("User@Example.COM") # => "user@example.com"

Documentation

Please see the Getting Started guide for installation and setup instructions.

License

The gem is available as open source under the terms of the MIT License.