Authentication type required to connect to the SMTP host.
property AuthenticationType: TAuthenticationType;
Description
AuthenticationType is a TAuthenticationType property that specifies the authentication type used by an E-Mail server. AuthenticationType can contain one of the following values:
atNone - no authentication is required
atLogin - simple username and password authentication is required (AUTH LOGIN)
You can find the authentication mechanisms supported on an E-Mail server by using AuthSchemesSupported.