We released another phase of our summer spam upgrades today. Users and administrators now have the ability to Safelist and Blacklist IP addresses. Like the email address Safelisting and Blacklisting, this takes affect within Postfix, which means whitelisted email messages will bypass spam filtering and Blacklisted emails will not be accepted by our servers. This ensures that the email you want gets to you quickly and accurately and the email you don’t want doesn’t clutter your inbox or spam folder. You can also Safelist or Blacklist entire IP address ranges, making this very powerful for large organizations.
This feature is available in the control panel today for all customers, and will be available in webmail once you upgrade to Harbinger (you will be able to upgrade starting sometime next week).