Event type signalled to perform account authentication.

TUserHandler = procedure (ASender: TIdCommand; var Accept: Boolean; Username, Password: string) of object;

Indicates if the authentication is successful.

Command generating the event notification.

Client credentials used for authorization.

Client identity used for authorization.

TUserHandler is an event type signalled when a threaded client is authenticated during connection. TUserHandler is the event type generated for the TIdSMTPServer.CheckUser event handler, and allows the SMTP server to perform validation of Username and Password values read from the client connection.

An event handler for the TUserHandler event type can be used to access the data store for account identities and credentials to perform authentication for the values in Username and Password. The event handler may also set the value in Accepted to True, to indicate that authentication is successful, or False to indicate that authentication has failed.