Fixed email FROM address formatting that was breaking Django's email parser.
The display name contained an '@' symbol which violated RFC 5322 format.
Changes:
- Fix Authentik email FROM address (remove @ from display name)
- Add Mailgun SMTP credential cleanup on server destruction
- Fix Mailgun delete task to use EU API endpoint
- Add cleanup playbook for graceful resource removal
This ensures:
✓ Recovery emails work immediately on new deployments
✓ SMTP credentials are automatically cleaned up when destroying servers
✓ Email configuration works correctly across all environments
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
