Update or change your email settings in Outlook for Windows
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Open Outlook and select File.
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Use the dropdown under Account Information to select the account you want to change.
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Select Account Settings.
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Select Server Settings.
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In the 'Incoming mail' section, make sure that the Server is set to 'mail.' and then your domain. (for example, if your email address is 'jane.smith@examplewebsite.com' then your Server should be 'mail.examplewebsite.com')
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Repeat step 5 for the 'Outgoing mail' section.
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When you're done updating your settings, select Next > Done.
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Confirm that incoming email is working by requesting Outlook to check for new mail.
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Confirm that outgoing email is working by sending a new test message to another one of your email addresses.