If your emails start bouncing with an error message similar to the one below after configuring the SpamExperts email filtering service:

550-Please turn on SMTP Authentication in your mail
   client, or login to the 550-IMAP/POP3 server before sending your message.
   mx48.antispamcloud.com 550-[31.204.154.235]:54550 is not permitted to relay
   through this server 550 without authentication.

log in to cPanel and find the Email pane.

Then click on the Email Routing.

Check to ensure that the Mail Exchanger is set to Local Mail Exchanger

This means that the server always accepts & delivers mail to the local mailbox for this domain.

SpamExperts recommend reviewing the information in the following knowledgebase article at Incoming Rejection Classifications

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