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=item I<set_date>(date, gmt_offset)

=item I<set_date_from_string>(str)

Set the sent-date on the MIME message. You can give a date string
or the numbers (time in seconds and offset in hours and minutes).
E.g.

    $msg->set_date(991697409, '+0100');
    $msg->set_date("Wed, 7 Mar 2001 03:00:01 +0100 (CET)");

=item I<get_date>()

Get the sent-date of the MIME message. In scalar
context returns date as a string value,
otherwise two element array - time in seconds and gmt_offset.

=item I<set_message_id>(message_id)

=item I<get_message_id>()