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Question: Suddenly cannot send emails - Server response: authentication required

iMac suddenly cannot send emails - Server response: authentication required. Service provider finds nothing wrong in email setup with incoming mail server and outgoing mail server. Can send emails from iPad on same email address with same incoming mail server and outgoing mail server set-ups.

iMac 21.5", macOS 10.13

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Question: Suddenly cannot send emails - Server response: authentication required