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+# POP3 - Post Office Protocol version 3 (popular e-mail protocol) - RFC 1939
+# Pattern quality: good veryfast
+#
+# This pattern has been tested somewhat.  If it does not
+# work for you, or you believe it could be improved, please post to 
+# l7-filter-developers@lists.sf.net .  This list may be subscribed to at
+# http://lists.sourceforge.net/lists/listinfo/l7-filter-developers
+
+# this is a difficult protocol to match because of the relative lack of 
+# distinguishing information.  Read on.
+pop3
+
+# this the most conservative pattern.  It should definitely work.
+#^(\+ok|-err)
+
+# this pattern assumes that the server says _something_ after +ok or -err
+# I think this is probably the way to go.
+^(\+ok |-err )
+
+# more that 90% of servers seem to say "pop" after "+ok", but not all.
+#^(\+ok .*pop)
+
+# Here's another tack. I think this is my second favorite.
+#^(\+ok [\x09-\x0d -~]*(ready|hello|pop|starting)|-err [\x09-\x0d -~]*(invalid|unknown|unimplemented|unrecognized|command))
+
+# this matches the server saying "you have N messages that are M bytes",
+# which the client probably asks for early in the session (not tested)
+#\+ok [0-9]+ [0-9]+
+
+# some sample servers:
+# RFC example:        +OK POP3 server ready <1896.697170952@dbc.mtview.ca.us>
+# mail.dreamhost.com: +OK Hello there.
+# pop.carleton.edu:   +OK POP3D(*) Server PMDFV6.2.2 at Fri, 12 Sep 2003 19:28:10 -0500 (CDT) (APOP disabled)
+# mail.earthlink.net: +OK NGPopper vEL_4_38 at earthlink.net ready <25509.1063412951@falcon>
+# *.email.umn.edu:    +OK Cubic Circle's v1.22 1998/04/11 POP3 ready <7d1e0000da67623f@aquamarine.tc.umn.edu>
+# mail.yale.edu:      +OK POP3 pantheon-po01 v2002.81 server ready
+# mail.gustavus.edu:  +OK POP3 solen v2001.78 server ready
+# mail.reed.edu:      +OK POP3 letra.reed.edu v2002.81 server ready
+# mail.bowdoin.edu:   +OK mail.bowdoin.edu POP3 service (iPlanet Messaging Server 5.2 HotFix 1.15 (built Apr 28 2003))
+# pop.colby.edu:      +OK Qpopper (version 4.0.5) at basalt starting.
+# mail.mac.com:       +OK Netscape Messaging Multiplexor ready
+
+# various error strings:
+#-ERR Invalid command.
+#-ERR invalid command
+#-ERR unimplemented
+#-ERR Invalid command, try one of: USER name, PASS string, QUIT
+#-ERR Unknown AUTHORIZATION state command
+#-ERR Unrecognized command
+#-ERR Unknown command: "sadf'".