David B?rgin:
> Previously in a milter I have used presence of sendmail macro
> "{auth_authen}" to decide whether a sender is authenticated.
> 
> Now, in another milter I am using presence of macro "{auth_type}" to
> make that decision.
> 
> What is the recommended way of telling whether a sender is authenticated
> using sendmail macros? Is one of the auth macros a better choice, or is
> it the case that if one is defined all of them are?

{auth_author} is usually empty; the other {auth_*} macros contain
information from a successful client's AUTH request.

Postfix supports these {auth_*} macros:

#define S8_MAC_AUTH_TYPE        "{auth_type}"   /* SASL method */
#define S8_MAC_AUTH_AUTHEN      "{auth_authen}" /* SASL username */
#define S8_MAC_AUTH_AUTHOR      "{auth_author}" /* SASL sender */

They contain the expected ihformation:

    if (strcmp(name, S8_MAC_AUTH_TYPE) == 0)
        return (IF_SASL_ENABLED(state->sasl_method));
    if (strcmp(name, S8_MAC_AUTH_AUTHEN) == 0)
        return (IF_SASL_ENABLED(state->sasl_username));
    if (strcmp(name, S8_MAC_AUTH_AUTHOR) == 0)
        return (IF_SASL_ENABLED(state->sasl_sender));

They are sent during MAIL FROM:

milter_mail_macros = i {auth_type} {auth_authen} {auth_author} {mail_addr} 
{mail_host} {mail_mailer}

        Wietse

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