@@ -23,6 +23,9 @@ public class HostingAssetEntityValidatorRegistry {
         register(DOMAIN_SETUP, new HsDomainSetupHostingAssetValidator());
         register(DOMAIN_DNS_SETUP, new HsDomainDnsSetupHostingAssetValidator());
         register(DOMAIN_HTTP_SETUP, new HsDomainHttpSetupHostingAssetValidator());
+        register(DOMAIN_SMTP_SETUP, new HsDomainEMailSubmissionSetupHostingAssetValidator());

@@ -0,0 +21,4 @@
+
+    @Override
+    protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
+        return  Pattern.compile("^" + assetEntity.getParentAsset().getIdentifier() + Pattern.quote(IDENTIFIER_SUFFIX) + "$");

@@ -160,4 +166,32 @@ class HsDomainHttpSetupHostingAssetValidatorUnitTest {
                 "'DOMAIN_HTTP_SETUP:example.org|HTTP.config.subdomains' is expected to match any of [(?!-)[A-Za-z0-9-]{1,63}(?<!-)] but '@' does not match",
                 "'DOMAIN_HTTP_SETUP:example.org|HTTP.config.subdomains' is expected to match any of [(?!-)[A-Za-z0-9-]{1,63}(?<!-)] but 'example.com' does not match");
     }
+