2.2.1.1 SMTP_AUTH_NTLM_Initiation_Command Message

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The SMTP_AUTH_NTLM_Initiation_Command message initiates the NTLM authentication process for SMTP.

[RFC2554] section 4 defines the syntax of the SMTP AUTH command and related commands (for example, EHLO) to initiate authentication. The mechanism name for NTLM authentication is defined to be the string "NTLM" for the NTLM Authentication: SMTP Extension.