diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepository.java b/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepository.java
index 8f304ce8..51c3990e 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepository.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepository.java
@@ -4,6 +4,7 @@ import io.micrometer.core.annotation.Timed;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.Repository;
 
+import jakarta.validation.constraints.NotNull;
 import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
@@ -28,8 +29,8 @@ public interface HsOfficeContactRbacRepository extends Repository<HsOfficeContac
     @Timed("app.office.contacts.repo.findContactByEmailAddressImpl.rbac")
     List<HsOfficeContactRbacEntity> findContactByEmailAddressImpl(final String emailAddressExpression);
 
-    default  List<HsOfficeContactRbacEntity> findContactByEmailAddress(final String emailAddress) {
-        return findContactByEmailAddressImpl("$.** ? (@ == \"" + emailAddress + "\")");
+    default  List<HsOfficeContactRbacEntity> findContactByEmailAddress(@NotNull final String emailAddress) {
+        return findContactByEmailAddressImpl("$.** ? (@ like_regex \"" + emailAddress.replace("%", ".*") + "\")");
     }
 
     @Timed("app.office.contacts.repo.save.rbac")
diff --git a/src/main/resources/api-definition/hs-office/hs-office-contacts.yaml b/src/main/resources/api-definition/hs-office/hs-office-contacts.yaml
index 4694660b..0dff9a63 100644
--- a/src/main/resources/api-definition/hs-office/hs-office-contacts.yaml
+++ b/src/main/resources/api-definition/hs-office/hs-office-contacts.yaml
@@ -18,7 +18,7 @@ get:
           required: false
           schema:
               type: string
-          description: Beginning of email-address to filter the results.
+          description: Beginning of email-address to filter the results, use '%' as wildcard.
     responses:
         "200":
             description: OK
diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepositoryIntegrationTest.java b/src/test/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepositoryIntegrationTest.java
index 379c8137..5b59f3b6 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepositoryIntegrationTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactRbacRepositoryIntegrationTest.java
@@ -188,12 +188,12 @@ class HsOfficeContactRbacRepositoryIntegrationTest extends ContextBasedTestWithC
     class FindByEmailAddress {
 
         @Test
-        public void globalAdmin_withoutAssumedRole_canViewAllContacts() {
+        public void globalAdmin_withoutAssumedRole_canFindContactsByEmailAddress() {
             // given
             context("superuser-alex@hostsharing.net", null);
 
             // when
-            final var result = contactRepo.findContactByEmailAddress("contact-admin@secondcontact.example.com");
+            final var result = contactRepo.findContactByEmailAddress("%@secondcontact.example.com");
 
             // then
             exactlyTheseContactsAreReturned(result, "second contact");