Synopsis:
Proofpoint: Safe and blocked lists; how to manage them

Solution:
The following was obtained Proofpoint's support web site. If you wish to add entries to your block list, see these instructions.

Matching an entire domain or a sub-domain
You can safe/block list a sub-domain, or an entire domain. Enter @foofoo.com if you wish to only safelist mail from the main foofoo.com domain. However, if you wish to safelist mail from any foofoo.com host, enter foofoo.com without the @ symbol; this will match any host/sub-domain.

Case-sensitivity
Safe/Blocked list entries should always match regardless of case. For example, if you enter USER@Domain.com, it should match user@domain.com and vice versa.

Blocklists
It is not currently possible to add a "blocklist" link to the digest. You must open your Manage My Account page and add the blocklist address manually.

From address vs. Sender address
While it is "legal" to use a different From (or, display) email address than the one used as the Sender address, spammers often use this loophole to make the email "look" like it's coming from a more reputable sender. Proofpoint matches against the Sender address, so the email address which appears in the email client as "From" will not always be the address which should be entered in the safe/block list. A user may need to view the email header in order to see the real Sender address. Clicking the safelist link from the digest automatically uses the Sender address and relieves the user of this task.