I want to receive mail from a known list of email addresses and block all others. How do I set up this filter?

Issue

I want to receive mail from a known list of email addresses and block all others. How do I set up this filter?

Solution

As of Release 3.4, you can implement domain filtering using either the CLI or the Administration Suite. You can use domain filtering on the "From" field. You are limited to 200 filters.

Creating Domain Filters Using the CLI

To create domain filters in the CLI, use the Filter Add command. You can enter a maximum of 20 addresses per filter, and receive mail from 4000 addresses per domain.

Filter Add (Domain=Any) "Allow List" Keep anyof stop

Enter filter rules, then finish with a dot (.) on a line by itself:

:envelopefrom matches "jnissen*"

:envelopefrom matches "jberry*"

:envelopefrom matches "vhanks*"

:envelopefrom matches "ddinapoli*"

OK Completed

Filter Add (Domain=Any) "Discard All" Discard allof Stop

.

Enter filter rules, then finish with a dot (.) on a line by itself:

:envelopefrom matches "*"

.

OK Completed

Creating Domain Filters Using the Administration Suite

Using the Administration Suite, navigate to Content Filtering > Advanced then do the following: 

1. With Any selected, click Add Filter.

2. In Filter Conditions - Add New Filter, do the following:

a. Select If all of these conditions are met:.

b. Expand the -- Choose Attribute -- pull-down menu, then select From (message envelop):.

c. Select matches, then type the email address you want to allow mail from in the dialog box.

d. Click the More >> button to add another rule, and repeat the steps above for each email address or domain to be added.

e. Select Apply to all messages.

3. In Filter Actions, do the following:

a. Select Keep (process normally).

b. Select Do not apply any more filters to this message if action is taken.

4. Click OK.

5. Return to the Content Filtering > Advanced menu.

6. With Any selected, click Add Filter.

7. In Filter Conditions - Add New Filter, do the following:

a. Select If all of these conditions are met:.

b. Expand the -- Choose Attribute -- pull-down menu, then select From (message envelop):.

c. Select matches, then type "*" in the dialog box.

d. Select Apply to all messages.

8. In Filter Actions, do the following:

a. Select Discard (message is irrevocably lost).

b. Select Do not apply any more filters to this message if action is taken.

9. Click OK.