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3.1.5 Message Processing Events and Sequencing Rules

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The NT LAN Manager (NTLM) Authentication: Simple Mail Transfer Protocol (SMTP) Extension is driven by a series of message exchanges between an SMTP server and an SMTP client. The rules governing the sequencing of commands and the internal states of the client and server are defined by a combination of [RFC2554] and [MS-NLMP]. Section 3.1.1 completely defines how the rules specified in [RFC2554] and [MS-NLMP] govern SMTP authentication.