tlsProtocol

Because TLS versions older than TLS 1.2 are declared as "deprecated" by the IETF, the mail sender now supports only version 1.2 or newer of the TLS protocol.

As the OpenSSL interface behind this option is declared as "deprecated", in future the option will be replaced by the options tlsMinProtcolVersion and tlsMaxProtocolVersion.

Some of these versions can be activated selectively using the tlsProtocol option.

tlsProtocol

[+ | - ] { TLSv1.2 | TLSv1.3 | All } ...

+

The protocol specified after this sign is permissible.

-

The protocol specified after this sign is not permissible.

If neither “+” nor “-” is specified, this has the same effect as specifying “+”.

TLSv1.2

TLS protocol version 1.2

TLSv1.3

TLS protocol version 1.3

ALL

All protocol versions are to be enabled.

All is the default.

Example

The specifications tlsProtocol TLSv1.2 TLSv1.3 and tlsProtocol All have the same effect.