# first try, without calling quits
$ telnet *host* 110
Trying *host*...
Connected to *host*.
Escape character is '^]'.
+OK Qpopper (version 4.0.5) at *host* starting.  <76162.1072222944@*host*>
user *user*
+OK Password required for *user*.
pass invalidpass
-ERR [AUTH] Password supplied for "*user*" is incorrect.
+OK Pop server at *host* signing off.
Connection closed by foreign host.

# second try, now calling quit
$ telnet *host* 110
Trying *host*...
Connected to *host*.
Escape character is '^]'.
+OK Qpopper (version 4.0.5) at *host* starting.  <76181.1072223079@*host*>
user *user*
+OK Password required for *user*.
pass invalidpass
-ERR [AUTH] Password supplied for "*user*" is incorrect.
quit
+OK Pop server at *host* signing off.
Connection closed by foreign host.