Add nullcheck for ipAddresses.

Mark van Tilburg · Mark van Tilburg · commit 8990492bd0c6 · 2026-04-29T16:39:03.000+02:00
diff --git a/BusinessMonitor.MailTools/Mx/MxValidator.cs b/BusinessMonitor.MailTools/Mx/MxValidator.cs
@@ -39,9 +39,9 @@ public MxValidationResult ValidateMxRecords(string domain)
             foreach (var mxRecord in mxRecords)
             {
                 var ipAddresses = _resolver.GetAddressRecords(mxRecord);
-                if (ipAddresses.Any(ip => ip.ToString() == "127.0.0.1"))
-                {
-                    result.InvalidMxRecords.Add(mxRecord);
+				if (ipAddresses != null && ipAddresses.Any(ip => ip.ToString() == "127.0.0.1"))
+				{
+					result.InvalidMxRecords.Add(mxRecord);
                 }
             }
 

Original file line number	Diff line number	Diff line change
`@@ -39,9 +39,9 @@ public MxValidationResult ValidateMxRecords(string domain)`
`39`	`39`	`foreach (var mxRecord in mxRecords)`
`40`	`40`	`{`
`41`	`41`	`var ipAddresses = _resolver.GetAddressRecords(mxRecord);`
`42`		`- if (ipAddresses.Any(ip => ip.ToString() == "127.0.0.1"))`
`43`		`- {`
`44`		`- result.InvalidMxRecords.Add(mxRecord);`
	`42`	`+ if (ipAddresses != null && ipAddresses.Any(ip => ip.ToString() == "127.0.0.1"))`
	`43`	`+ {`
	`44`	`+ result.InvalidMxRecords.Add(mxRecord);`
`45`	`45`	`}`
`46`	`46`	`}`
`47`	`47`