How do I activate SMTP authentication in Apple Mail?
Here you can find a detailed manual how you can activate the SMTP authentification in Apple Mail.
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Open the mail "Settings" via the menu:
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Click "Accounts"
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Under "Account Information", click on "SMTP Server" at the bottom, and then on "Edit SMTP Server List":
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Click on "Extended", and then on "Password" in "Identification":
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Enter the same access data as for the incoming server