can't fetch e-mails from QMail/RedHat

Hi, I am running RedHat Enterprise server 3 with QMail. My problem: I have a few e-mail-accounts from which I can easily fetch e-mail with my Outlook (Outlook 6 on Windows 2000) using POP3, but there are accounts where it doesn't work. All informations and logins are PERFECTLY CORRECT, but still, when pressing the send/receive-button of Outlook I will get that small popup-window which asks for correct login-informations... This problem is really strange, but I hope to find someone here who probably experienced the same... ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform linux