WHEN I TRY TO SEND EMAIL TO A CLIENT IT COMES BACK WITH A MESSAGE 550 HOST UNKNOWN. WHEN I SEND IT IN A DIFFERENT PROGRAM IT GOES THROUGH, I.E. EXPRESS OR WEB MAIL. JUST NOT IN OUTLOOK
First, please don't type in all caps - it's difficult to read and is
considered "shouting".
That said, have you verified that your SMTP (outgoing server) settings in
Outlook are *identical* to that in Outlook Express?
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