3.2.4.5 Lower-Layer SMTP MTA Interaction

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An SMTP message (as specified in [RFC2822]) is prepared as follows.

  • The To field MUST be equal to the Send-Recipient-Mail-Address string variable.

  • The Subject field MUST be computed by prepending the Unicode string "Intersite message for NTDS Replication:" to the Send-Commentary string variable. Unicode MIME support for SMTP header fields is as specified in [RFC2047].

  • The following MIME options (as specified in [RFC2045]) MUST be set in the headers of the SMTP message.

    • MIME-Version: 1.0 or higher

    • Content-Transfer-Encoding: base64

    • Content-Type: image/gif

  • The Send-Message-Frame byte stream MUST be encoded with MIME base64-encoding [RFC2045].

  • The base64-encoded Send-Message-Frame byte stream MUST be used as the body of the SMTP message.

The SMTP message is given to the SMTP Mail Transfer Agent (MTA) and directs it to perform a send operation to the address specified by the Send-Recipient-Mail-Address string variable.<15>