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supports O
server O
side O
encryption O
, O
Simple B-Protocol
Mail I-Protocol
Transfer I-Protocol
Protocol I-Protocol
( O
SMTP B-Protocol
) O
, O
Post B-Protocol
Office I-Protocol
Protocol I-Protocol
( O
POP O
) O
, O
Internet B-Protocol
Message I-Protocol
Access I-Protocol
Protocol I-Protocol
( O
IMAP B-Protocol
) O
and O
Hypertext B-Protocol
Transfer I-Protocol
Protocol I-Protocol
( O
HTTP B-Protocol
) O
. O
</s>
<s>
Each O
successful O
reception O
and O
execution O
of O
a O
command O
is O
acknowledged O
by O
the O
server B-Application
with O
a O
result B-Protocol
code I-Protocol
and I-Protocol
response I-Protocol
message I-Protocol
( O
e.g. O
, O
250 O
Ok O
) O
. O
Since O
a O
message O
body O
can O
contain O
a O
line O
with O
just O
a O
period O
as O
part O
of O
the O
text O
, O
the O
client B-Protocol
sends O
two O
periods O
every O
time O
a O
line O
starts O
with O
a O
period O
; O
correspondingly O
, O
the O
server B-Application