[Mimedefang] timeout before data read / smfi_chgheader returned MI_FAILURE

[Jurgen Botz]

MIMEDefang suddenly stopped working on one of my servers this
morning.  I get the following errors... anyone have any idea
what might be causing this?

Nov 22 09:33:53 kahuna sendmail[5903]: iAMHXhdD005903: Milter 
(mimedefang): timeout before data read
Nov 22 09:33:53 kahuna sendmail[5903]: iAMHXhdD005903: Milter 
(mimedefang): to error state
Nov 22 09:33:53 kahuna sendmail[5903]: iAMHXhdD005903: Milter: data, 
reject=451 4.7.1 Please try again later
Nov 22 09:33:53 kahuna sendmail[5903]: iAMHXhdD005903: 
to=<jbotz at osafoundation.org>, delay=00:00:10, pri=60358, stat=Please try 
again later
Nov 22 09:33:53 kahuna sendmail[5903]: iAMHXhdD005903: 
to=<jurgen at botz.org>, delay=00:00:10, pri=60358, stat=Please try again later
Nov 22 09:33:54 kahuna mimedefang[5656]: iAMHXhdD005903: smfi_chgheader 
returned MI_FAILURE
Nov 22 09:33:54 kahuna mimedefang[5656]: iAMHXhdD005903: smfi_chgheader 
returned MI_FAILURE
Nov 22 09:33:54 kahuna mimedefang[5656]: iAMHXhdD005903: smfi_addheader 
returned MI_FAILURE

:j