[otrs] problem with POP3 postmaster.pl fetching mail

Gang sorry if this question has been asked before but, I have a new install (so far so good) and have configured the postmaster.pl to reflect y mail server but when I execute the script manually I get Auth for user xx@xx.com failed! traceback 29770 main fetchmail line: 140 ./PostMasterPOP3.pl Line: 106. Does anyone know what this could be failing? I tested the same information in a mail client on the same network and had no problem fetching the email. Thanks for all replies. TT