Set up an email program to use encrypted communication on Mac OS
To set your Mac OS email program to use port 465, follow these steps:
The first step:
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Open OS X Mail.
The second step:
Then go to Mail > Preferences
The third step:
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Click On Accounts
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Click on the email account you wish to modify (lsdemo for example)
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Click on Outgoing Mail Server and from the drop-down menu choose …Edit SMTP Server List to reset it
The fourth step:
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Click on Advanced
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Deselect Automatically detect and maintain account settings
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Ensure that the port in question is 465
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Click on OK
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Close the Accounts window Accounts
Step Five:
Click on Window and choose Connection Doctor
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Wait for the setup to be tested
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If the test was successful, close the window and then try to send and receive messages through the email you set up
