NetSPF is a SPF verification utility for .NET.
- Current Version:
1.2.0 - Target Framework:
.NET Standard 2.0
In keeping with convention the SpfResolver class provides a function called
CheckHost as an entry point to verification. CheckHost takes the following
parameters:
- IPAddress, (IPv4 or IPv6) the IP emitting the mail.
- domainName, the domain label from MAIL FROM or HELO.
- sender, the MAIL FROM or HELO identity, e.g. noreply@domain.com.
- heloDomain, the domain label presented by the client in HELO or EHLO.
- hostDomain, the domain of the current host performinng authentication.
- dnsHost (optional), specific DNS host to query.
- SpfExpression Array, (optional) SPF expressions to use if the domain doesn't provide records in DNS.
For example:
var ipAddress = IPAddress.Parse("11.22.33.44");
var result = SpfResolver.CheckHost(ipAddress, "zz.com", "noreply@zz.com", "zz.com", "aa.com");
// Using a specific DNS host.
var dnsHost = IPAddress.Parse("1.1.1."); // Clodflare DNS
var ipAddress = IPAddress.Parse("11.22.33.44");
var result = SpfResolver.CheckHost(ipAddress, "zz.com", "noreply@zz.com", "zz.com", "aa.com", dnsHost);
CheckHost returns a KeyValuePair<SpfResult, string> where string is an explanation if any or simply the string representation of the SpfResult