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3.2 Server Details

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The server role MUST conform to [RFC5321] for the exchange of messages with the client. The server role MUST conform to the SMTP Service Extension for Authentication specified in [RFC2554] and SHOULD<2> conform to the SMTP Service Extension for Authentication specified in [RFC4954]. Throughout this section, SMTP Service Extension for Authentication refers to whichever version of the SMTP Service Extension for Authentication that the server supports.

The SMTP extension to support internationalized email addresses is specified in [RFC6531].