<s>
Dovecot	B-Language
is	O
an	O
open-source	B-Application
IMAP	B-Protocol
and	O
POP3	B-Protocol
server	B-Application
for	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
written	O
primarily	O
with	O
security	O
in	O
mind	O
.	O
</s>
<s>
Timo	O
Sirainen	O
originated	O
Dovecot	B-Language
and	O
first	O
released	O
it	O
in	O
July	O
2002	O
.	O
</s>
<s>
Dovecot	B-Language
developers	O
primarily	O
aim	O
to	O
produce	O
a	O
lightweight	O
,	O
fast	O
and	O
easy-to-set-up	O
open-source	B-Application
email	O
server	B-Application
.	O
</s>
<s>
The	O
primary	O
purpose	O
of	O
Dovecot	B-Language
is	O
to	O
act	O
as	O
mail	O
storage	O
server	B-Application
.	O
</s>
<s>
Mail	O
is	O
delivered	O
to	O
the	O
server	B-Application
using	O
some	O
mail	B-Protocol
delivery	I-Protocol
agent	I-Protocol
(	O
MDA	O
)	O
and	O
stored	O
for	O
later	O
access	O
with	O
an	O
email	B-Protocol
client	I-Protocol
(	O
mail	B-Protocol
user	I-Protocol
agent	I-Protocol
,	O
or	O
MUA	O
)	O
.	O
</s>
<s>
Dovecot	B-Language
can	O
also	O
act	O
as	O
mail	O
proxy	B-Application
server	I-Application
,	O
forwarding	O
connection	O
to	O
another	O
mail	O
server	B-Application
,	O
or	O
act	O
as	O
a	O
lightweight	O
MUA	O
in	O
order	O
to	O
retrieve	O
and	O
manipulate	O
mail	O
on	O
remote	O
server	B-Application
for	O
e.g.	O
</s>
<s>
According	O
to	O
the	O
,	O
as	O
of	O
2020	O
,	O
Dovecot	B-Language
has	O
an	O
installed	O
base	O
of	O
at	O
least	O
2.9million	O
IMAP	B-Protocol
servers	I-Protocol
,	O
and	O
has	O
a	O
global	O
market	O
share	O
of	O
76.9	O
%	O
of	O
all	O
IMAP	B-Protocol
servers	I-Protocol
.	O
</s>
<s>
Dovecot	B-Language
can	O
work	O
with	O
standard	O
mbox	B-Application
,	O
Maildir	O
,	O
and	O
its	O
own	O
native	O
high-performance	O
dbox	O
formats	O
.	O
</s>
<s>
It	O
is	O
fully	O
compatible	O
with	O
UW	B-Protocol
IMAP	I-Protocol
and	O
Courier	B-Protocol
IMAP	I-Protocol
servers’	O
implementation	O
of	O
them	O
,	O
as	O
well	O
as	O
mail	B-Protocol
clients	I-Protocol
accessing	O
the	O
mailboxes	O
directly	O
.	O
</s>
<s>
Dovecot	B-Language
also	O
includes	O
a	O
mail	B-Protocol
delivery	I-Protocol
agent	I-Protocol
(	O
called	O
Local	B-Protocol
delivery	I-Protocol
agent	I-Protocol
in	O
Dovecot	B-Language
's	O
documentation	O
)	O
and	O
an	O
LMTP	B-Protocol
server	B-Application
,	O
with	O
optional	O
Sieve	O
filtering	O
support	O
.	O
</s>
<s>
Dovecot	B-Language
supports	O
a	O
variety	O
of	O
authentication	O
schemas	O
for	O
IMAP	B-Protocol
,	O
POP	B-Protocol
and	O
message	B-Protocol
submission	I-Protocol
agent	I-Protocol
(	O
MSA	O
)	O
access	O
,	O
including	O
CRAM-MD5	O
and	O
the	O
more	O
secure	O
DIGEST-MD5	B-Protocol
.	O
</s>
<s>
With	O
version	O
2.2	O
,	O
some	O
new	O
features	O
have	O
been	O
added	O
to	O
Dovecot	B-Language
,	O
e.g.	O
</s>
<s>
additional	O
IMAP	B-Protocol
command	O
extensions	O
,	O
dsync	O
has	O
been	O
rewritten	O
or	O
optimized	O
,	O
and	O
shared	O
mailboxes	O
now	O
support	O
per-user	O
flags	O
.	O
</s>
<s>
Version	O
2.3	O
adds	O
a	O
message	B-Protocol
submission	I-Protocol
agent	I-Protocol
,	O
Lua	O
scripting	O
for	O
authentication	O
,	O
and	O
some	O
other	O
improvements	O
.	O
</s>
<s>
Apple	O
Inc	O
.	O
includes	O
Dovecot	B-Language
for	O
email	O
services	O
since	O
Mac	O
OS	O
X	O
Server	B-Application
10.6	O
Snow	O
Leopard	O
.	O
</s>
<s>
In	O
2017	O
,	O
Mozilla	B-Operating_System
,	O
via	O
the	O
Mozilla	B-Operating_System
Open	O
Source	O
Support	O
program	O
,	O
conducted	O
a	O
security	O
audit	O
on	O
the	O
Dovecot	B-Language
software	O
,	O
the	O
first	O
public	O
audit	O
of	O
the	O
Dovecot	B-Language
code	O
.	O
</s>
