3.1 Client Details

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The client role MUST conform to [RFC5321] and for the exchange of messages with the server. The client role MUST conform to the SMTP Service Extension for Authentication specified in [RFC2554] and SHOULD<1> conform to 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 client supports.

When supporting email addresses in internationalized forms, the client role MUST conform to [RFC6531].