tlsSecureConnection

The tlsSecureConnection option specifies whether the SMTP connection to the SMTP server is to be secured with TLS.

tlsSecureConnection

NONE | OPTIONAL | REQUIRE

NONE

The SMTP connection is never secured (default).

OPTIONAL

The SMTP connection is secured if the SMTP server supports it. If not, an unsecured connection is used, when the option tlsMode is set to EXPLICIT.

REQUIRE

The SMTP connection is closed if the SMTP server does not support security.