Glossary
S/MIME
Secure/Multipurpose Internet Mail Extensions: a way to sign and encrypt email using certificates.
ValidReach Team · Updated 2026-10-26
In practice
A signature proves who sent a message and that it was not altered. Encryption needs the recipient’s certificate as well as yours, which is why it is common inside organisations and rare in marketing mail.
Verification and sending
Not related to verification; it protects message content, not the address.