Duncan Findlay notes:
I was experiencing a munging problem with spamassasin and exim -> procmail (without fetchmail). For me the problem was in exim.conf.
To fix this, in the transports section, in the procmail_pipe section,
command = "/usr/bin/procmail -d ${local_part}"
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should be changed to
command = "/usr/bin/procmail"
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also ensure that in the same section,
user = $local_part
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This fixed the problem for me. Hopefully this might help someone else.