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Le 17/11/2023 à 16:34, Juan Concepcion a écrit :
Good morning,

We have a situation where we need to lookup the SPF record for an email address before using it.

In windows, it would be something like:
nslookup -type=TXT <hostname>

In Unix, it would be something like:
dig -t txt <hostname>

For .Net, there are some projects like ARSoft.Tools.Net (also available as a NuGet Package) where you can do something like:
var spfValidator = new ARSoft.Tools.Net.Spf.SpfValidator();
var mailIpAddress = IPAddress.Parse("X.X.X.X");
var domain = "example.com";
var senderAddress = "sender@xxxxxxxxxxx";
ARSoft.Tools.Net.Spf.SpfQualifier result = spfValidator.CheckHost(mailIpAddress, domain, senderAddress);
There are multiple workarounds for different programming languages and platforms.


How can we do it on IBM i? Is there a way to check for SPF record using RPG or SQL?

Does DIG HOSTNAME(<domain>) TYPE(*TXT) gives you something? You should be able to output it into an IFS file.
DIG is part of 5770SS1 option 31 Domain Name System operating system option.




TIA,

Juan Concepcion



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