Glossary
SSL
Secure Sockets Layer, the old protocol for encrypting connections; today the name is often used for its successor, TLS.
ValidReach Team · Updated 2026-10-26
In practice
Real SSL versions are obsolete and insecure. Mail servers now use TLS, either on connect (ports 465 and 993) or by upgrading a plain connection with STARTTLS.
Verification and sending
Not related to verification; it protects the connection between servers.