OUTLOOK & OUTLOOK EXPRESS
OUTLOOK
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Once you have opened your Outlook, click File in the top left corner
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Under the heading Account Information, there is a dropdown box where you can select the email account you want to select
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Once you have selected the email address, click on Account Settings
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You will then see a dropdown of options, click Server Settings
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You will then see your IMAP Account Settings, click Outgoing Mail
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That will open up your Outgoing Mail Settings
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In here, change the port number to 587
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In the Encryption Method, change to STARTTLS
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Click Next, and you should see that your Account has been successfully updated
OUTLOOK EXPRESS
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Open Outlook Express, and click on Tools. In the Tools menu, select Accounts.
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Double click on the email account you wish to amend.
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Under the Advance tab, change the Outgoing server (SMTP) port to 587.

