| S/MIME | Secure Multipurpose Internet Mail Extensions 
| Others |
| S/MIME | Secure/Multipurpose Internet Mail Extensions
| Others |
| SMIME | Secure Multi-purpose Internet Mail Extensions
| Others |
| SMIME | Secure Multimedia Internet Mail Extension
| Others |
| SMIME | Secure Multipurpose Internet Mail Extension
| Others |
| SMIME | Secure Multipurpose Internet Mailman Efn
| Others |
| SMIME | Security Multipurpose Internet Mail Extension
| Others |