Julien ÉLIE <jul...@trigofacile.com> added the comment:

David:  no, the RFC does not mention UTF-8 about AUTHINFO.
Please note the subtlety:

   command =/ authinfo-sasl-command /
        authinfo-user-command /
        authinfo-pass-command

   authinfo-sasl-command = "AUTHINFO" WS "SASL" WS mechanism
        [WS initial-response]
   authinfo-user-command = "AUTHINFO" WS "USER" WS username
   authinfo-pass-command = "AUTHINFO" WS "PASS" WS password

   initial-response = base64-opt
   username = 1*user-pass-char
   password = 1*user-pass-char
   user-pass-char = B-CHAR

   ;   U- means based on UTF-8, excluding NUL CR and LF
   ;   B- means based on bytes, excluding NUL CR and LF
   U-CHAR     = CTRL / TAB / SP / A-CHAR / UTF8-non-ascii
   B-CHAR     = CTRL / TAB / SP / %x21-FF


That is not for nothing that B-CHAR are explicitly mentioned.  And *not* U-CHAR.
That is why I insist on that fact, and I fear the new nntplib implementation 
using UTF-8 is breaking the NNTP protocol at some places...

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<http://bugs.python.org/issue10284>
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