1 Introduction

The Simple Mail Transfer Protocol (SMTP) AUTH Extension for SPNEGO enables SMTP clients and servers to negotiate a mutually supported authentication mechanism by using the Simple and Protected GSS-API Negotiation Mechanism (SPNEGO).

Sections 1.5, 1.8, 1.9, 2, and 3 of this specification are normative. All other sections and examples in this specification are informative.

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