To change the outgoing mail server port in Outlook, do the following:
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From the Tools menu select "Account Settings..."
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From the E-mail tab, double click on the email account that you want to change the outgoing server (SMTP) port on.
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Click on the "More Settings" button.
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Click on the Advanced tab and change the "Outgoing server (SMTP)" setting to 2525:
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Click OK and you're done.