Similar to Microsoft Exchange, some NoSpamProxy features can only be enabled through a PowerShell cmdlet. Specifying an “SPF-authenticated corporate email server” is one such feature. Entries of this kind facilitate the maintenance of NoSpamProxy enormously. “Corporate email servers” define the servers of a company that are allowed to use owned domains in email sender addresses. By default, IP addresses, subnets, host names, TLS-authenticated hosts, and Office 365 tenants can be specified.