diff --git a/sdk/domain_authentication.go b/sdk/domain_authentication.go
index a27251d..d6a1811 100644
--- a/sdk/domain_authentication.go
+++ b/sdk/domain_authentication.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"log"
 	"net/http"
 )
 
@@ -153,7 +154,7 @@ func (c *Client) ValidateDomainAuthentication(ctx context.Context, id string) Re
 		}
 	}
 
-	_, statusCode, err := c.Post(ctx, "POST", "/whitelabel/domains/"+id+"/validate", nil)
+	respBody, statusCode, err := c.Post(ctx, "POST", "/whitelabel/domains/"+id+"/validate", nil)
 	if err != nil || statusCode != 200 {
 		return RequestError{
 			StatusCode: statusCode,
@@ -161,9 +162,34 @@ func (c *Client) ValidateDomainAuthentication(ctx context.Context, id string) Re
 		}
 	}
 
+	res, err := unmarshall(respBody)
+	if err != nil {
+		return RequestError{
+			StatusCode: http.StatusInternalServerError,
+			Err:        err,
+		}
+	}
+
+	if valid, ok := res["valid"].(bool); ok && !valid {
+		return RequestError{
+			StatusCode: http.StatusInternalServerError,
+			Err:        ErrDomainAuthenticationValidationFailed,
+		}
+	}
+
 	return RequestError{StatusCode: http.StatusOK, Err: nil}
 }
 
+func unmarshall(respBody string) (map[string]interface{}, error) {
+	var j map[string]interface{}
+	if err := json.Unmarshal([]byte(respBody), &j); err != nil {
+		log.Printf("JSON Unmarshalling of the response body: %s, failed with: %s,",
+			respBody, err)
+		return nil, err
+	}
+	return j, nil
+}
+
 // DeleteDomainAuthentication deletes an DomainAuthentication.
 func (c *Client) DeleteDomainAuthentication(ctx context.Context, id string) (bool, RequestError) {
 	if id == "" {
diff --git a/sdk/domain_authentication_test.go b/sdk/domain_authentication_test.go
index 43eb367..ea61a86 100644
--- a/sdk/domain_authentication_test.go
+++ b/sdk/domain_authentication_test.go
@@ -1,7 +1,10 @@
 package sendgrid_test
 
 import (
+	"context"
 	"errors"
+	"net/http"
+	"net/http/httptest"
 	"reflect"
 	"testing"
 
@@ -110,3 +113,71 @@ func Test_parseDomainAuthentication(t *testing.T) { //nolint:funlen
 		})
 	}
 }
+
+var (
+	mux    *http.ServeMux
+	server *httptest.Server
+)
+
+func setup() func() {
+	mux = http.NewServeMux()
+	server = httptest.NewServer(mux)
+	return func() {
+		server.Close()
+	}
+}
+func TestClient_ValidateDomainAuthentication_ShouldNotErrorForOkResponseCode(t *testing.T) {
+	teardown := setup()
+	defer teardown()
+	mux.HandleFunc("/whitelabel/domains/123/validate", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte(`{"valid":true}`))
+	})
+	client := sendgrid.NewClient("api-key", server.URL, "on-behalf")
+
+	requestError := client.ValidateDomainAuthentication(context.TODO(), "123")
+
+	if requestError.Err != nil {
+		t.Errorf("ValidateDomainAuthentication() got = %v, want %v", requestError, "error")
+	}
+}
+
+func TestClient_ValidateDomainAuthentication_ShouldErrorForErrorResponseCode(t *testing.T) {
+	teardown := setup()
+	defer teardown()
+	mux.HandleFunc("/whitelabel/domains/123/validate", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusBadRequest)
+		_, _ = w.Write([]byte(`{"valid":true}`))
+	})
+	client := sendgrid.NewClient("api-key", server.URL, "on-behalf")
+
+	requestError := client.ValidateDomainAuthentication(context.TODO(), "123")
+
+	if requestError.Err == nil {
+		t.Errorf("ValidateDomainAuthentication() got = %v, want %v", requestError, "error")
+	}
+}
+
+func TestClient_ValidateDomainAuthentication_ShouldErrorForResponseBodySayingValidFalse(t *testing.T) {
+	teardown := setup()
+	defer teardown()
+	mux.HandleFunc("/whitelabel/domains/123/validate", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte(`{"valid":false}`))
+	})
+	client := sendgrid.NewClient("api-key", server.URL, "on-behalf")
+
+	requestError := client.ValidateDomainAuthentication(context.Background(), "123")
+
+	if requestError.Err == nil {
+		t.Errorf("ValidateDomainAuthentication() got = %v, want %v", requestError, "error")
+	}
+	errMsg := sendgrid.ErrDomainAuthenticationValidationFailed.Error()
+	if requestError.Err.Error() != errMsg {
+		t.Errorf("ValidateDomainAuthentication() got = %v, want %v", requestError.Err.Error(),
+			errMsg)
+	}
+}
diff --git a/sdk/errors.go b/sdk/errors.go
index 0efeb82..9221969 100644
--- a/sdk/errors.go
+++ b/sdk/errors.go
@@ -43,9 +43,6 @@ var (
 	// ErrFailedCreatingSubUser error displayed when the provider can not create a subuser.
 	ErrFailedCreatingSubUser = errors.New("failed creating subUser")
 
-	// ErrFailedDeletingSubUser error displayed when the provider can not delete a subuser.
-	ErrFailedDeletingSubUser = errors.New("failed deleting subUser")
-
 	// ErrTemplateIDRequired error displayed when a template ID wasn't specified.
 	ErrTemplateIDRequired = errors.New("a template ID is required")
 
@@ -83,6 +80,8 @@ var (
 
 	ErrFailedDeletingDomainAuthentication = errors.New("failed deleting domain authentication")
 
+	ErrDomainAuthenticationValidationFailed = errors.New("domain authentication validation failed")
+
 	ErrLinkBrandingIDRequired = errors.New("link branding id is required")
 
 	ErrFailedDeletingLinkBranding = errors.New("failed to delete link branding")
diff --git a/sendgrid/resource_sendgrid_domain_authentication_validation.go b/sendgrid/resource_sendgrid_domain_authentication_validation.go
index 33c76bb..fe1b8c3 100644
--- a/sendgrid/resource_sendgrid_domain_authentication_validation.go
+++ b/sendgrid/resource_sendgrid_domain_authentication_validation.go
@@ -20,6 +20,7 @@ import (
 	sendgrid "github.com/octoenergy/terraform-provider-sendgrid/sdk"
 )
 
+// https://docs.sendgrid.com/api-reference/domain-authentication/validate-a-domain-authentication
 func resourceSendgridDomainAuthenticationValidation() *schema.Resource { //nolint:funlen
 	return &schema.Resource{
 		CreateContext: resourceSendgridDomainAuthenticationValidationCreate,
@@ -93,10 +94,6 @@ func resourceSendgridDomainAuthenticationValidationUpdate(
 	return validateDomain(ctx, d, m)
 }
 
-func resourceSendgridDomainAuthenticationValidationDelete(
-	ctx context.Context,
-	d *schema.ResourceData,
-	m interface{},
-) diag.Diagnostics {
+func resourceSendgridDomainAuthenticationValidationDelete(context.Context, *schema.ResourceData, interface{}) diag.Diagnostics {
 	return nil
 }