Get, compile, and install cyrus-sasl (current (2001-03-24) version: 1.5.27). Read the docs which come with it (as well as README and INSTALL). Cyrus SASL 2.x does not work with sendmail yet because the API has changed.
It would require custom programming. You could either write a mail filter using the new (currently not supported) Milter API in sendmail 8.10 and later (see libmilter/README) or you could look at some of these other unsupported hints: カスタムプログラミングが必要です。Sendmail8.10以降 (libmilter/README参照)の新しい(現在サポートされていない) Milter APIメールフィルターを書くか、 サポートされていないこれらのヒントをご覧ください:
Axel Reinhold's logall.c module http://www.freakout.de/logall.c メッセージID: <33AA593A.4B701C3F@syntegra.nl> procmailrc manページ #なぜに書くの迷ったか! sendmailの作者と同じで #"because we still believe a bit in privacy."