Emails from EPrints appear with "Unknown date" in some mail clients

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If no date is specified, MIME::Lite will automatically add a Date: header with the current date/time (timezone = UT).

Some (webmail) clients don't support UT dates, and display "Unknown date".

See:  http://forum.spamcop.net/forums/lofiversion/index.php/t9207.html  http://marc.info/?l=imp&m=119825252603323&w=2

We can explicitly provide the date to MIME::Lite, or tell it not to automatically add a Date: header and rely on the mail server/client to do something sensible (see Datestamp param).