MetaDefender Email Gateway Security 5.3.0 6. Releases 6.3. Version 5.0.2 6.4. Version 5.0.3 6.5. Version 5.1.0 6.6. Version 5.1.1 6.7. Version 5.2.0 6.8. Version 5.2.1 6.9. Version 5.2.2 6.10. Version 5.3.0 6.1. Version 5.0.0 6.2. Version 5.0.1