INTERFACE TO SMTP AUTHENTICATION MECHANISMS
-These are general SSL mechanisms, adapted for use with SMTP. Each
+These are general SASL mechanisms, adapted for use with SMTP. Each
authentication mechanism has three functions, for initialization, server
authentication, and client authentication.
the server and/or client functions are available for this authenticator.
Typically this depends on whether server or client configuration options have
been set, but it is also possible to have an authenticator that has only one of
-the server or client functions.
+the server or client functions. The function may not touch big_buffer.
SERVER AUTHENTICATION