I'm interested if the Ironport supports (or will in the future) querying the Spamhaus DBL: http://www.spamhaus.org/news.lasso?article=655 Unlike other DNS block lists, this one supports domain name queries only and does not support IP address queries...

We have the situation were we are signed up for feedback loops, but the recipient data is elided by the ISPs due to privacy concerns. They are also smart enough to elide the recipient data included in custom X-Headers that we add to all outgoing mai...

Any plans on adding this functionality to the C-Series? It's still surprisingly effective after all these years and could potentially increase capacity of the device.Effective implementations I've worked with had two greylisting features in common:-...