I have one workstation in an office of 37 workstations that has a problem with Outlook 2003. At least once a day Outlook will not send out e-mails. The computer will continue to receive e-mails but if he tries to respond or create a new e-mail to send it out they just sit in the Outbox. This is what I have tried so far, uninstalled and reinstalled the TCP/IP protocol, changed out the network card, created a new profile and updated Outlook with all the latest patches and updates. Outlook has two accounts setup, one is the pop3 account that sends and receives e-mails and he has an Exchange account that is basically only used to share his calendar and contacts with his secretary. Exchange is not setup to send or receive e-mail all e-mail is sent via the pop3 smtp server. Again this is the same setup as the other 36 computers. The computer is running Windows 2000 Professional with SP4, P4 3.2 ghz and 1 gig RAM. Where else should I be looking?
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I did all the suggestions and for now it seems to be working. The ISP has always been the SMTP server so that was not the issue. I did register the dll, increased the size of the mailbox, tested the connectivity and increased the time out limit. Thanks again for you help.