A: run bent like this:
B: ./bent -h 127.0.0.1 -p 110 -u user -s password -n 10000 -c stat -t 1000
C: netstat -an|grep 110|grep ESTABLISH|wc -l

or add some codes to missey.c and view the variable on console.
NOTES:
      when you benchmark the pop3 server. you'd better run the benchmarck
      program on other machines. benchmark on several machines is very good.
      If you run missey and bent at same server, the result you get maybe
      different from others. and there maybe also some thins happend that
      I don't know........ :-)

MY BENCHMARK: I USE:
#./bent -h 127.0.0.1 -p 110 -u user -s password -n 10000 -c noop -t 1000

at four console, I get more than 10k connections. :-)

BTW: My machine: CPU CR366, 256M RAM(pc133), 10G HD(5400 RPM).