F-Secure Internet Gatekeeper for Linux/Administrator’s Guide
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11.4
POP Proxy Process
This section describes how common protocols are processed with the POP proxy.
Proxy mode
Client
Internet Gatekeeper (fsigk,0.0.0.1)
POP server (popserver, 0.0.0.2)
TCP connect(to:
0.0.0.1:9110)
----------------------------->
+OK ... fsigk starting
<-----------------------------
USER user@popserver
----------------------------->
TCP connect(to:
0.0.0.2:110)
----------------------------->
+OK ... popserver
<-----------------------------
USER user
----------------------------->
+OK
+OK ...
<-----------------------------
<-----------------------------
PASS password
----------------------------->
PASS password
----------------------------->
+OK
+OK
<-----------------------------
<-----------------------------
LIST
----------------------------->
LIST
----------------------------->
1 1000 ...
1 1000 ...
<-----------------------------
<-----------------------------
RETR 1
----------------------------->
RETR 1
----------------------------->
E-mail body... .
<-----------------------------
(Virus scan)
E-mail body... .
<-----------------------------
RSET
----------------------------->
RSET
----------------------------->
+OK
+OK
<-----------------------------
<-----------------------------
QUIT
----------------------------->
QUIT
----------------------------->
+OK
+OK
<-----------------------------
<-----------------------------