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1.4 Relationship to Other Protocols

The SMTP Extensions extend [RFC5321], [RFC4954], and other related extensions.

The Relaxed AUTH Command Extension is used with SASL mechanisms, such as the NT LAN Manager (NTLM) Authentication: Simple Mail Transfer Protocol (SMTP) Extension specified in [MS-SMTPNTLM], that require the client to provide an initial response before the server can issue a challenge.

For conceptual background information and overviews of the relationships and interactions between this and other protocols, see [MS-OXPROTO].

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