check your setup and server are configured properly. to do this you will need to access your email account properties and specify whether the server you are trying to connect to and from is either a POP3 or SMTP server. This sounds like a protocol error. whatever it is it can be sorted. does it just come up on sending or does it come up on receiving too? if it comes up on both then it is more than just a protocol error.
if there are any more faults it may well be worth contacting you server administrator or ISP for more advice. Outlook 2003 works according to the ISP you are using. Your ISP will be able to provide you with the exact technical info that you need. Im a user of Outlook 2003 and i have Virgin.net as my ISP.
your required protocols can be found in your setup documentation.
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