Cpanel None Of The Authentication Methods Supported By This Client error fix
If you use whm / cpanel on your server and experience this error while sending and receiving emails, the problem is actually very simple
We come to Exim Configuration Manager from the whm panel.
Enter the Security section under the Basic Editor tab and click “Require clients to connect with SSL or issue the STARTTLS command before they are allowed to authenticate with the server.” section to Off and save.
You can fix the problem by doing these steps.
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