This kind of SPAM is a HTML message containing lines like this:
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This is a multi-part message in MIME format.
------=_NextPart_000_0001_01C67505.196FEE50
charset="us-ascii"
D
v=20
ea
i=20
r H
b=20
om
x=20
e O
g=20
wne
l=20
r,
Your c
z=20
re
e=20
di
k=20
t doesn't matter to us!
If you O
x=20
WN
r=20
r
k=20
ea
o=20
l e
o=20
st
w=20
at
k=20
e and want
I
u=20
MME
w=20
DIAT
g=20
E c
m=20
as
i=20
h to s
e=20
pe
f=20
nd ANY
way you like, or simply wish to
L
y=20
OW
x=20
ER your monthly
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Characters followed by =20 are displayed as a whitespace and will not be
visible in mail clients, such as KMail, so the original content is shown.
This type of message offten get relatively low spam score, since the message
body also contains a whole paragraph of generated (meaningless) English text.
I suggest to implement a new filter that strips out invisible characters
followed by =20 and allows the Bayes filter to detect the SPAMish content.
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