Email filtered or bypass with no visible Spam filter configured.

Symptoms

Emails are bypassed/filtered and not delivered to the final local recipient; however, no visible filter is enabled via cPanel's "Spam Filters". 

Description

Email delivery fails with the following error message in the exim_mainlog file:

=> /dev/null <email_id@example.com> R=virtual_user_filter T=**bypassed**

We've opened an internal case for our development team to investigate this further. For reference, the case number is CPANEL-45840. Follow this article to receive an email notification when a solution is published in the product. 

Workaround

Adjust the custom SpamAssassin filter, or disable it from the cPanel interface.

1. Navigate to "Home / Email / Email Accounts / Manage / Manage Email Filters"
   
2. Click on "Delete" or "Edit" for any filter that has a SpamAssassin rule.