Many states maintain their own database of individuals and entities they sanction. Several call for or require health care entities to screen against this list. This is in addition to not in lieu of screening against the Federal sanction information.
Spam-Filter.com is a fully managed domain-wide email spam filter service hosted in the cloud which works with Microsoft Exchange Server and ALL Mail Servers. Email is filtered before it arrives at your mail server.
A high pass filter is a filter which passes high-frequency signals and blocks, or impedes, low-frequency signals. In other words, high-frequency signals go through much easier and low-frequency signals have a much harder getting through, which is why it's a high pass filter.