- Plesk for Linux
- The following error appears while sending a test message in Outlook when using Plesk mail server:
CONFIG_TEXT: Send test e-mail message: None of the authentication methods supported by this client are supported by your server.
- The following error message appears in Android when setting up a mail account:
CONFIG_TEXT: Server does not support authentication.
- TCP port 587 open in firewall.
- TCP port 587 is configured according to How to enable 587 submission port on Linux?
- Mail server configuration was checked with the article SMTP authentication fails on Plesk with SMTP: Authentication methods aren't supported by server.
Mail server has a certificate issued for one domain (usually the one at Tools&Settings > Server Settings > Full hostname).
Mail clients connect to mail server using their own mail.example.com.
As a result, mail client warns that the domain the certificate is issued for doesn't match making not possible the connection.
In the settings of the mail account, it's needed to specify an encryption type from none to TLS/Auto, but depends on the mail client used:
Open Outlook Settings:
Select your email account from the list and click Change. Email settings should be displayed.
Click More Settings... button.
On the tab Outgoing Server, enable the option My outgoing server (SMTP) requires authentication and select Use same settings as my incoming mail server settings.
On the tab Advanced, set Outgoing server (SMTP) to use port 587 and set Use the following type of encrypted connection to Auto.
Click OK to update the settings.
Click Next and then, click Finish.
- Open Settings > Accounts > + Add account > Email app (or edit the mailbox with the issue)
- Enter the email address and click on Manual Setup > IMAP account
- Change Security type from None to TLS (Accept all certificates)
- Complete mailbox setup (server, password, etc)
Make sure that Enable SMTP service on port 587 on all IP addresses (Enable message submission for Plesk 12.0 and lower) is enabled in Tools & Settings > Mail Server Settings on Plesk server:
Connect to the server via SSH.
In the file
/etc/postfix/main.cf, comment the option
smtpd_sasl_security_optionsand add the line
smtpd_tls_security_level = may.
To apply changes, restart Postfix using the command:
# service postfix restart