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". 

Cause

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

CONFIG_TEXT: => /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. 

Resolution

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

1. Access the cPanel directly as the user or through WHM.
2. Navigate to Home / Email / Email Accounts / Manage / Manage Email Filters.
3. Click on Delete or Edit for any filter that has a SpamAssassin rule and remove it.

Rules may also be configured within the Webmail interface:

1. Access webmail as the mail user, or through the cPanel
2. From the main webmail interface, navigate to Fight Spam / Spam Filters
3. Click on Delete or Edit for any filter that has a SpamAssassin rule and remove it.