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Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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Your SMTP server that you setup in Outlook is not available in all areas. You need to change to an SMTP server that works in your area or you need to use webmail.
Some ISP you cannot blocks your SMTP server. You can try alternate SMTP port 587 to send emails.
Best wishes!