Some useful data validators:
- validate email address for correct syntax
- check email domain is a disposable service or not
- check any IPv4 for blacklists
- cache data lists in memory for speed
// return true
IsDisposableEmailProvider("disposableaddress.com")
// return false
IsDisposableEmailProvider("gmail.com")
// return true
IsSuspiciousIPv4("141.98.10.125")
// return false
IsSuspiciousIPv4("1.1.1.1")