Problem with long subject lines

current version of hypermail has problems (dies) when it encounters a message whose subject is very long (I suspect over 256 characters but haven't checked exactly). The following message demonstrates the problem for me. I've had a quick look at what I think are the relevant bits of code but can't see the problem.

Paul

>From deregulate_at_juno.com Tue May 26 20:21:52 1998
Date: Tue, 26 May 1998 20:20:48 +0100 (BST) Message-Id: <199805261920.UAA27999_at_naga.mailbase.ac.uk> Subject: <<<<<< Debt Relief >>>>>>

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  From: deregulate_at_juno.com To: deregulate_at_juno.com