<s>
Mailwasher	B-Application
is	O
an	O
email	O
filtering	O
software	O
for	O
Windows	B-Application
that	O
can	O
detect	O
and	O
delete	O
spam	O
from	O
a	O
user	O
's	O
email	O
when	O
it	O
is	O
on	O
the	O
mail	O
server	O
,	O
before	O
being	O
downloaded	O
to	O
the	O
user	O
's	O
computer	O
.	O
</s>
<s>
Mailwasher	B-Application
was	O
developed	O
by	O
the	O
New	O
Zealand	O
based	O
company	O
Firetrust	O
.	O
</s>
<s>
It	O
uses	O
a	O
combination	O
of	O
user	O
defined	O
filters	O
,	O
spam	O
databases	O
and	O
Bayesian	B-Application
filtering	O
.	O
</s>
<s>
The	O
filter	O
works	O
on	O
a	O
small	O
portion	O
of	O
each	O
email	O
,	O
and	O
then	O
allows	O
unwanted	O
emails	O
to	O
be	O
directly	O
deleted	O
from	O
the	O
user	O
's	O
POP3	B-Protocol
inbox	O
,	O
without	O
downloading	O
them	O
to	O
the	O
email	B-Protocol
client	I-Protocol
on	O
the	O
user	O
's	O
computer	O
.	O
</s>
<s>
The	O
free	O
version	O
can	O
access	O
only	O
a	O
single	O
mail	O
account	O
and	O
does	O
not	O
contain	O
the	O
Bayesian	B-Application
learning	O
filter	O
.	O
</s>
