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Fouten en oplossingen

fout (0x800CCC80): Deze server ondersteunt geen enkele verificatiemethode die door deze client wordt ondersteund.

Browse to "WHM >> Exim Configuration Manager >> Basic Editor" and review the following option under the "Security" tab:

"Require clients to connect with SSL or issue the STARTTLS command before they are allowed to authenticate with the server."

Disabling this option will significantly decrease the security of the server by allowing the plaintext transmission of authentication credentials, however it should allow your users to connect.