How to fix Outlook 421 Error cannot Connect to SMTP Server Error on Windows 11/10

Configurare noua (How To)

Situatie

Outlook Error 421 is a common critical SMTP error that hampers transmissions of emails.

Solutie

Pasi de urmat

Open the Outlook app, select the “File” menu.

change smtp port number 1

Now, tap “Account Settings”

change smtp port number 2

Now, choose your account and select “Change”.

change smtp port number 3

Look for the “Outgoing mail server (SMTP)” and key in the address provided by the web host.

change smtp port number 4

Click “More Settings” > Outgoing Server” > check “My outgoing server (SMTP) requires authentication” > “Use the same settings as my incoming mail server”.

change smtp port number 5

  • Return to “More Settings” > click “Advanced”
  • Change port number and save settings

change smtp port number 6

Tip solutie

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