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    returned unmodified.
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  =\?                   # literal =?
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  \?                    # literal ?
  (?P<encoding>[qb])    # either a "q" or a "b", case insensitive
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ddddg|d|dddddddddddddg|d d |d|d!|d"|d#|fS(%s�Returns a date string as specified by RFC 2822, e.g.:

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    Optional timeval if given is a floating point time value as accepted by
    gmtime() and localtime(), otherwise the current time is used.

    Optional localtime is a flag that when True, interprets timeval, and
    returns a date relative to the local timezone instead of UTC, properly
    taking daylight savings time into account.

    Optional argument usegmt means that the timezone is written out as
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d|}tj�}d|||||f}|S(s�Returns a string suitable for RFC 2822 compliant Message-ID, e.g:

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