imp 2.3.6

[Will]

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hey,

i just insatlled imp 2.3.6 and when trying to compose a message i get 
this error.

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Warning: Failed opening 'Mail/rfc822.php' for inclusion 
(include_path='/usr/local/lib/php:.') in ../lib/MIME.php on line 73

Fatal error: Undefined class name 'mail_rfc822' in ../lib/MIME.php on line 75
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I do not have that file in /usr/local/lib/php/Mail
onle sendmail.php and smtp.php

I am running PHP4.0.4pl1

ideas are appreciated..

Thanks

will
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