[imp] IMP can't parse Date header for horde-bugs mailing list

[Arjen de Korte]

Since August 23rd, the mailing list 'bugs at horde.org' sends messages  
with multiple (identical) dates in the Date header (see excerpt below):

> From: bugs at horde.org
> Subject: [Tickets #8535] Re: Net_IMSP Sends too many strings as literals
> Date: Thu, 27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400, Thu,
> 	27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400, Thu,
> 	27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400, Thu,
> 	27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400, Thu,
> 	27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400, Thu,
> 	27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400, Thu,
> 	27 Aug 2009 19:51:16 -0400, Thu, 27 Aug 2009 19:51:16 -0400
> MIME-Version: 1.0

Should IMP parse the above header correctly and show a valid date  
(which it currently it says 'Unknown Date' in the overview) or is  
there something wrong with the setup with the mailing list server?

I'm subscribed to a couple of Horde related mailing lists, but  
horde-bugs is the only one showing this behavior.

Best regards, Arjen