<s>
Mailfence	B-Application
is	O
an	O
encrypted	B-Protocol
email	I-Protocol
service	O
that	O
offers	O
OpenPGP	O
based	O
end-to-end	O
encryption	O
and	O
digital	O
signatures	O
.	O
</s>
<s>
It	O
was	O
launched	O
in	O
November	O
2013	O
by	O
ContactOffice	O
Group	O
,	O
which	O
has	O
been	O
operating	O
an	O
online	B-Application
collaboration	I-Application
suite	I-Application
for	O
universities	O
and	O
other	O
organizations	O
since	O
1999	O
.	O
</s>
<s>
In	O
the	O
midst	O
of	O
2013	O
,	O
the	O
Mailfence	B-Application
project	O
was	O
started	O
by	O
the	O
founders	O
of	O
ContactOffice	O
.	O
</s>
<s>
In	O
January	O
2021	O
,	O
Mailfence	B-Application
released	O
progressive	B-Application
web	I-Application
application	I-Application
for	O
mobile	O
devices	O
.	O
</s>
<s>
On	O
5	O
March	O
2020	O
,	O
Mailfence	B-Application
reported	O
that	O
their	O
SMTP	O
servers	O
are	O
blocked	O
by	O
Russian	O
based	O
email	O
services	O
.	O
</s>
<s>
Mailfence	B-Application
did	O
not	O
respond	O
to	O
this	O
request	O
,	O
citing	O
obligation	O
to	O
provide	O
information	O
about	O
users	O
,	O
violating	O
its	O
Terms	O
and	O
the	O
federal	O
Belgian	O
laws	O
.	O
</s>
<s>
Mailfence	B-Application
provides	O
secure	B-Protocol
email	I-Protocol
features	O
,	O
with	O
other	O
functions	O
such	O
as	O
Calendar	O
,	O
Contacts	O
,	O
Documents	O
and	O
Collaboration	O
.	O
</s>
<s>
The	O
service	O
supports	O
POP/IMAP	O
and	O
Exchange	B-Protocol
ActiveSync	I-Protocol
as	O
well	O
as	O
vanity	B-Protocol
domains	I-Protocol
with	O
SPF	B-Protocol
,	O
DKIM	B-Protocol
,	O
DMARC	O
and	O
catch-all	O
address	O
support	O
.	O
</s>
<s>
The	O
contacts	O
support	O
(	O
CSV	O
,	O
vCard	O
,	O
LDIF	O
)	O
import	O
,	O
(	O
vCard	O
,	O
PDF	B-Application
)	O
export	O
and	O
can	O
be	O
accessed	O
using	O
CardDAV	B-Protocol
.	O
</s>
<s>
The	O
calendar	O
supports	O
vCal/iCal	O
import	O
,	O
export	O
and	O
can	O
be	O
accessed	O
by	O
using	O
CalDAV	B-Protocol
.	O
</s>
<s>
The	O
documents	O
can	O
be	O
accessed	O
using	O
WebDAV	B-Protocol
or	O
edited	O
online	O
.	O
</s>
<s>
Mailfence	B-Application
Polls	O
is	O
a	O
secure	O
meeting	O
scheduler	O
.	O
</s>
<s>
Jabber/XMPP	B-Protocol
protocol	I-Protocol
is	O
the	O
base	O
of	O
Mailfence	B-Application
chat	O
functionality	O
.	O
</s>
<s>
First	O
named	O
Jabber	B-Protocol
,	O
then	O
XMPP	B-Protocol
(	O
Extensible	B-Protocol
Messaging	I-Protocol
and	I-Protocol
Presence	I-Protocol
Protocol	I-Protocol
)	O
,	O
this	O
open-source	O
protocol	O
has	O
been	O
created	O
for	O
instant	O
messaging	O
.	O
</s>
<s>
The	O
web-interface	O
comes	O
with	O
an	O
embedded	O
IMAP	B-Protocol
,	O
POP3	B-Protocol
,	O
CalDAV	B-Protocol
,	O
and	O
WebDAV	B-Protocol
client	O
.	O
</s>
<s>
Mailfence	B-Application
is	O
therefore	O
not	O
subjected	O
to	O
US	O
gag	O
orders	O
and	O
NSLs	O
,	O
notwithstanding	O
extradition	O
treaties	O
with	O
the	O
US	O
.	O
</s>
<s>
Aside	O
from	O
conventional	O
security	O
and	O
privacy	O
features	O
including	O
managing	O
access	O
or	O
generating	O
specific	O
password	O
for	O
web	O
and	O
non-web	O
services	O
,	O
two-factor	O
authentication	O
,	O
spam	B-Language
protection	I-Language
alongside	O
of	O
plus	O
addressing	O
,	O
sender	O
address	O
blacklist	O
and	O
whitelist	O
,	O
Mailfence	B-Application
offers	O
following	O
features	O
:	O
</s>
<s>
The	O
service	O
uses	O
TLS	B-Protocol
with	O
ephemeral	O
key	B-Protocol
exchange	I-Protocol
to	O
encrypt	O
all	O
internet	O
traffic	O
between	O
users	O
and	O
Mailfence	B-Application
servers	O
.	O
</s>
<s>
HSTS	B-Protocol
,	O
MTA-STS	O
and	O
DANE	B-Protocol
standards	O
are	O
also	O
supported	O
.	O
</s>
<s>
OpenPGP	O
keypair	O
is	O
generated	O
in	O
client-browser	O
,	O
encrypted	O
(	O
via	O
AES256	B-Algorithm
)	O
with	O
the	O
user	O
's	O
passphrase	O
,	O
and	O
then	O
stored	O
on	O
Mailfence	B-Application
server	O
.	O
</s>
<s>
The	O
service	O
provides	O
an	O
integrated	O
keystore	B-General_Concept
to	O
manage	O
OpenPGP	O
keys	O
,	O
and	O
does	O
not	O
require	O
any	O
third-party	O
add-on/plugin	O
.	O
</s>
