Email Validation with SMTP Verification

This module extends the base email validation functionality with SMTP-based verification. It adds an advanced layer of validation by performing a partial SMTP connection to verify the existence of email addresses, significantly improving validation accuracy without requiring paid external API services.

Key features include:

• SMTP-based mailbox verification
• Integration with the base email validation system
• No external API dependencies or costs
• High accuracy compared to DNS-only or syntax-only checks
• Non-intrusive verification without sending actual emails

Technical Details

• Implementation: Adds a new validator to the kw.email.validator model
• Validation Method:
  • Establishes an SMTP connection to the recipient's mail server
  • Performs SMTP handshake and RCPT TO command
  • Verifies server response to determine if the mailbox exists
  • Gracefully closes the connection without sending actual email
• Performance:
  • More thorough than DNS checks but requires more time
  • Configurable timeout settings to prevent long-running validations

Benefits

• Cost-Effective: No external API costs or rate limits
• Privacy: Email addresses are not shared with third-party services
• Accuracy: Higher accuracy than DNS-only or syntax-only validation
• Mailbox Verification: Can detect non-existent mailboxes in valid domains
• Self-Hosted: Complete control over the validation process

Limitations

While SMTP validation provides high accuracy, it has some limitations:

• Some mail servers may block SMTP verification attempts
• Cannot reliably detect catch-all email configurations
• Cannot detect disposable email addresses
• May be slower than API-based validation services
• For these advanced validations, consider using API-based validators

Dependencies

• kw_email_validation: Base module providing core validation functionality

Configuration

No additional configuration is required for this module.

Bug Tracker

Bugs are tracked on https://kitworks.systems/requests. In case of trouble, please check there if your issue has already been reported.

Maintainer

KitWorks Systems. Our web site: https://kitworks.systems

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