Unable to set up mail accout in Outlook using port 587 for SMTP without encryption: None of the selected authentication protocols specified are supported by the server

Created:

2017-04-07 20:15:18 UTC

Modified:

2017-08-08 13:44:52 UTC

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Unable to set up mail accout in Outlook using port 587 for SMTP without encryption: None of the selected authentication protocols specified are supported by the server

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • Postfix is used as mail server.

  • Unable to add mailbox into Outlook with port 587 for SMTP and without encryption. The following error is shown in Outlook during connection test:

    Error: None of the selected authentication protocols specified are supported by the server.
    

Cause

Misconfiguration of Postfix.

Resolution

  1. Change value of the smtpd_tls_security_level parameter to may in the Postfix main configuration file /etc/postfix/main.cf :

    # vi /etc/postfix/main.cf
    ..........
    smtpd_tls_security_level = may
    ..........
  2. Reload Postfix configuration:

    # service postfix reload
    
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