<s>
Cleanfeed	B-Application
is	O
a	O
spam	B-Application
filter	O
for	O
use	O
with	O
Usenet	B-Application
news	I-Application
groups	O
.	O
</s>
<s>
As	O
well	O
as	O
blocking	O
spam	B-Application
,	O
it	O
is	O
also	O
able	O
to	O
block	O
binary	B-Algorithm
image	I-Algorithm
posts	O
in	O
non-binary	O
news	O
groups	O
and	O
HTML	B-Language
posts	O
.	O
</s>
<s>
It	O
is	O
published	O
under	O
the	O
Artistic	B-License
License	I-License
.	O
</s>
<s>
Cleanfeed	B-Application
was	O
originally	O
developed	O
and	O
maintained	O
by	O
Jeremy	O
Nixon	O
and	O
later	O
by	O
Marco	O
d'Itri	O
,	O
with	O
the	O
last	O
formal	O
update	O
being	O
released	O
on	O
5th	O
Aug	O
2001	O
.	O
</s>
<s>
He	O
later	O
developed	O
PyClean	O
,	O
a	O
python	O
equivalent	O
to	O
Cleanfeed	B-Application
.	O
</s>
