Best Web Host Help Page – Account level Anti-Spam email filters

Best Web Host Control Panel (cpanel) Anti-spam Account level filters allow you to create mail filters for all of your domain’s email accounts.

Best Practices

We strongly recommend using multiple, simple filters instead of a single, monolithic filter. Exim, your server’s mail transfer agent, handles many small rules much more efficiently than it handles a single large rule.

Exim has an implicit limit on how large an error message can be. Excessively large filters can exceed that limit whenever an error is encountered, making debugging impossible.

Add an Account Level Filter

It is important to give the filter an appropriate name, as it will make the task of managing existing filters easier in the future.

The Edit Filter for All Mail on Your Account screen.

To create a new filter:

  1. Click Create a new Filter.

  2. Type a name for the filter in the Filter Name box.

  3. Select a message characteristic from the first pull-down menu.

  4. Select an operator from the next pull-down menu.

  5. Enter the characters or words you wish to use as a filter.You can add and subtract rules by clicking the + and buttons.

    • Note: This field will accept regular expressions (when you select the matches regex operator), rather than more commonly used wildcard characters. It is best to NOT use special characters in the filters

  6. Select an action from the pull-down menu under the Actions heading. You can add and subtract actions by clicking the + and – buttons.

  7. Click Activate to initialize the filter.

A word about operators: When you create a filter using several operators, it may be useful to note that
Best Web Host Control Panel (cpanel) will always process the “and” operator before the “or” operator. As a result, email filters will be processed as follows:

  • A or B and C will be processed as A or (B and C).

  • A and B or C will be processed as (A and B) or C.

If you wish to create a filter such as (A or B) and (C or D), you would have to create it like so:

  • (A and C) or (A and D) or (B and C) or (B and D).

Test a Filter

Once a filter has been created, it can be tested.

To test your filter:

  1. Type a test email message in the text box below the Filter Test heading.Click Test Filter.

    • Be sure to include the characters or words that you have set up your filter to catch.

Edit a Custom Filter

You can also modify an existing filter.

To edit an existing filter:

  1. Click Edit next to the appropriate filter name.

  2. You can adjust any of the fields displayed — the message characteristic, operator, term to filter, or resulting action.

  3. Click Activate to initialize the filter.

Delete an Existing Filter

To delete a filter:

  1. Click Delete.

  2. Confirm that the filter should be deleted on the following page.