MetaDefender Email Gateway Security 5.4.1 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 6.11. Version 5.4.0 6.12. Version 5.4.1 6.1. Version 5.0.0 6.2. Version 5.0.1