Description of problem:
--- snipp ---
# fetchmail -a -vvv
fetchmail: 6.2.5 querying pop.gmx.net (protocol POP3) at Tue Mar 16 
21:12:20 2004: poll started
fetchmail: POP3< +OK GMX POP3 StreamProxy ready <XXXXX.
YYYYYYYYYY@xy123>
fetchmail: POP3> CAPA
fetchmail: POP3< -ERR Unknown command.
fetchmail: Unknown command.
fetchmail: Repoll immediately on XXXXXXX.net
fetchmail: POP3< +OK GMX POP3 StreamProxy ready <XXXXX.
YYYYYYYYYY@xy123>
fetchmail: POP3> CAPA
fetchmail: POP3< -ERR Unknown command.
fetchmail: Unknown command.
fetchmail: Repoll immediately on XXXXXXX.net
fetchmail: POP3< +OK GMX POP3 StreamProxy ready <XXXXX.
YYYYYYYYYY@xy123>
fetchmail: POP3> CAPA
fetchmail: POP3< -ERR Unknown command.
fetchmail: Unknown command.
fetchmail: Repoll immediately on XXXXXXX.net
fetchmail: POP3< +OK GMX POP3 StreamProxy ready <XXXXX.
YYYYYYYYYY@xy123>
fetchmail: POP3> CAPA
fetchmail: POP3< -ERR Unknown command.
fetchmail: Unknown command.
fetchmail: Repoll immediately on XXXXXXX.net
[Ctrl + C]
fetchmail: terminated with signal 2
#
--- snapp ---

Result: I'm unable to fetch e-mails via pop3 about my mail provider,
because there is an error loop :-(

Version-Release number of selected component (if applicable):
fetchmail-6.2.5-1

How reproducible & Steps to Reproduce:
1. Get fetchmail-6.2.5-1
2. Rebuild it
3. Try to get mails from a mail provider - e.g. GMX (www.gmx.net)
  
Actual results:
So I tried to locate cause of the problem:

--- snipp ---
# grep CAPA SOURCES/*
SOURCES/fetchmail-6.2.0-gsspop.patch:       ok = gen_transact(sock, 
"CAPA");
#
--- snapp ---

I disabled that patch and rebuilded it again:

--- snipp ---
# fetchmail -a -vvv
fetchmail: 6.2.5 querying pop.gmx.net (protocol POP3) at Tue Mar 16 
21:19:47 2004: poll started
fetchmail: POP3< +OK GMX POP3 StreamProxy ready <XXXXX.
YYYYYYYYYY@xy123>
fetchmail: POP3> CAPA
fetchmail: POP3< -ERR Unknown command.
fetchmail: Unknown command.
fetchmail: Repoll immediately on XXXXXXX.net
fetchmail: POP3< +OK GMX POP3 StreamProxy ready <XXXXX.
YYYYYYYYYY@xy123>
fetchmail: POP3> USER XXXXXXX
fetchmail: POP3< +OK May I have your password, please?
fetchmail: POP3> PASS *
fetchmail: POP3< +OK mailbox has 0 messages (0 octets)
fetchmail: POP3> STAT
fetchmail: POP3< +OK 0 0
fetchmail: No mail for XXXXXXX at pop.gmx.net
fetchmail: POP3> QUIT
fetchmail: POP3< +OK bye
fetchmail: 6.2.5 querying pop.gmx.net (protocol POP3) at Tue Mar 16 
21:19:51 2004: poll completed
#
--- snapp ---

Expected results & Additional info:
Without the patch "fetchmail-6.2.0-gsspop.patch" all works fine, 
here. Is it possible, that your patch contains an error which causes
the loop?

My knowledge about C isn't very good, but I think, the error is
maybe located at: fetchmail-6.2.0/pop3.c @@ -199,7 +199,12 @@ 
(changed by your patch).