diff --git a/checker/provider.go b/checker/provider.go
index d66de34..2cf6a50 100644
--- a/checker/provider.go
+++ b/checker/provider.go
@@ -2,9 +2,6 @@ package checker
 
 import (
 	"encoding/json"
-	"fmt"
-	"net/mail"
-	"strings"
 	"time"
 
 	sdk "git.happydns.org/checker-sdk-go/checker"
@@ -24,27 +21,6 @@ func (p *happyDeliverProvider) Definition() *sdk.CheckerDefinition {
 	return Definition()
 }
 
-// ValidateOptions runs on the host before Collect so bad options are rejected
-// up-front rather than surfacing as a runtime SMTP failure.
-func (p *happyDeliverProvider) ValidateOptions(opts sdk.CheckerOptions) error {
-	raw, ok := opts["from_address"]
-	if !ok {
-		return nil
-	}
-	s, ok := raw.(string)
-	if !ok {
-		return fmt.Errorf("from_address must be a string")
-	}
-	s = strings.TrimSpace(s)
-	if s == "" {
-		return nil
-	}
-	if _, err := mail.ParseAddress(s); err != nil {
-		return fmt.Errorf("invalid from_address: %w", err)
-	}
-	return nil
-}
-
 func (p *happyDeliverProvider) ExtractMetrics(ctx sdk.ReportContext, collectedAt time.Time) ([]sdk.CheckMetric, error) {
 	var data HappyDeliverData
 	if err := json.Unmarshal(ctx.Data(), &data); err != nil {
diff --git a/checker/provider_test.go b/checker/provider_test.go
index e57c4e7..f2d9629 100644
--- a/checker/provider_test.go
+++ b/checker/provider_test.go
@@ -86,8 +86,8 @@ func TestDefinitionShape(t *testing.T) {
 	if def.ID != "happydeliver" {
 		t.Errorf("ID = %q", def.ID)
 	}
-	if !def.Availability.ApplyToService {
-		t.Error("should apply to service")
+	if !def.Availability.ApplyToDomain {
+		t.Error("should apply to domain")
 	}
 	if !def.HasMetrics {
 		t.Error("HasMetrics should be true")