Authentication Failed. Update your server settings

[ByteHamster]

Do you use Gmail or Outlook.​com? This post might be useful then:

"Authentication failed" with Gmail and Outlook.com

Hi You’ll probably have to enable IMAP and/or set up an app password. For Gmail: https://support.google.com/mail/answer/7126229?hl=en For Outlook: https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040 and https://support.microsoft.com/en-us/office/add-your-outlook-com-account-to-another-mail-app-or-smart-device-73f3b178-0009-41ae-aab1-87b80fa94970