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1 Introduction

The Simple Mail Transfer Protocol (SMTP) Extensions extend SMTP standards to facilitate authentication negotiation between a client and a server and to enable the server to close connections that exceed configured thresholds.

Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also normative but do not contain those terms. All other sections and examples in this specification are informative.

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