Email Error “none of the authentication methods supported by this client are supported by your server”


The error occurs if an encryption type is not specified in the mail client.

example error: !task [email protected] – Sending’ reported error (0x800CCC80): ‘None of the authentication methods supported by this client are supported by your server.‘


Change the encryption type from None to TLS or Auto

let’s get started

If you receive the above error in Outlook, to fix this issue, please do the following:

  • Click on File > Account Settings > Account Settings
  • Select the email account, and then click Change
  • Click More Settings and navigate to the Outgoing tab
  • Check ‘My outgoing server requires authentication’ and use same settings as my incoming server
  • Select Outgoing (SMTP) to use port 25,26 or 465 and set “Use the following type of encrypted connection” to “Auto” or “TLS”
  • (Mac client Outgoing mail server (SMTP) settings -> Use SSL -> Select SSL or TLS)
  • If you are using secure ports the please set the encrypted connection to “SSL”
  • Click OK to update the settings.
  • this could be done from the server side disabling “Require clients to connect with SSL or issue the STARTTLS command before they are allowed to authenticate with the server.” but that will significantly decrease the security of the server by allowing the plaintext transmission of authentication credentials, so better security it’s always better to use secure transmission.

    Secure SSL/TLS Settings for Cpanel servers
    Username: [email protected]
    Password: Use the email account’s password.
    Incoming Server:
    IMAP Port: 993 / POP3 Port: 995
    Outgoing Server:
    SMTP Port: 465
    IMAP, POP3, and SMTP require authentication.

    done 🙂

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