diff --git a/sugoi-api-ldap-store-provider/src/main/java/fr/insee/sugoi/store/ldap/LdapReaderStore.java b/sugoi-api-ldap-store-provider/src/main/java/fr/insee/sugoi/store/ldap/LdapReaderStore.java
index 09520620..3aadc017 100644
--- a/sugoi-api-ldap-store-provider/src/main/java/fr/insee/sugoi/store/ldap/LdapReaderStore.java
+++ b/sugoi-api-ldap-store-provider/src/main/java/fr/insee/sugoi/store/ldap/LdapReaderStore.java
@@ -369,11 +369,15 @@ public Optional<User> getUserByMail(String mail) {
     logger.debug("Searching user with mail {}", mail);
     User searchedUser = new User();
     searchedUser.setMail(mail);
-    PageResult<User> users =
-        searchUsers(searchedUser, new PageableResult(2, 0, null), SearchType.OR.name());
+    List<User> users =
+        searchUsers(searchedUser, new PageableResult(2, 0, null), SearchType.OR.name())
+            .getResults()
+            .stream()
+            .filter(u -> u.getMail().equalsIgnoreCase(mail))
+            .collect(Collectors.toList());
     User user = null;
-    if (users.getResults().size() == 1) {
-      user = users.getResults().get(0);
+    if (users.size() == 1) {
+      user = users.get(0);
       if (user.getAddress() != null && user.getAddress().getId() != null) {
         PostalAddress address = getAddress(user.getAddress().getId());
         if (address != null) {
@@ -384,7 +388,7 @@ public Optional<User> getUserByMail(String mail) {
       if (user.getOrganization() != null) {
         user.setOrganization(getOrganization(user.getOrganization().getIdentifiant()).orElse(null));
       }
-    } else if (users.getResults().size() > 1) {
+    } else if (users.size() > 1) {
       throw new MultipleUserWithSameMailException(mail);
     }
     return Optional.ofNullable(user);
diff --git a/sugoi-api-ldap-store-provider/src/test/java/fr/insee/sugoi/ldap/LdapReaderStoreTest.java b/sugoi-api-ldap-store-provider/src/test/java/fr/insee/sugoi/ldap/LdapReaderStoreTest.java
index 2fa8150f..601e34ea 100644
--- a/sugoi-api-ldap-store-provider/src/test/java/fr/insee/sugoi/ldap/LdapReaderStoreTest.java
+++ b/sugoi-api-ldap-store-provider/src/test/java/fr/insee/sugoi/ldap/LdapReaderStoreTest.java
@@ -15,9 +15,11 @@
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import fr.insee.sugoi.ldap.utils.config.LdapConfigKeys;
 import fr.insee.sugoi.model.*;
+import fr.insee.sugoi.model.exceptions.MultipleUserWithSameMailException;
 import fr.insee.sugoi.model.fixtures.StoreMappingFixture;
 import fr.insee.sugoi.model.paging.PageResult;
 import fr.insee.sugoi.model.paging.PageableResult;
@@ -371,4 +373,44 @@ public void userWithoutPasswordShouldHaveValueHasPassword() {
         ldapReaderStore.getUser("agarder").get().getAttributes().get("hasPassword"),
         is(false));
   }
+
+  @Test
+  @DisplayName(
+      "Given a user which mail is unique in the realm"
+          + "the user should be retrievable via its mail")
+  public void getUserByMailTest() {
+    assertThat(
+        "Should be the user mail1",
+        ldapReaderStore.getUserByMail("userwithuniqueemail@insee.fr").get().getUsername(),
+        is("mail1"));
+  }
+
+  @Test
+  @DisplayName(
+      "Given a user which mail is unique in the realm "
+          + "even though his mail is a sub of another user mail "
+          + "the user should be retrievable via its mail")
+  public void getUserByMailWithSubMailTest() {
+    assertThat(
+        "Should be the user mailsub",
+        ldapReaderStore.getUserByMail("userwithsubemail@insee.fr").get().getUsername(),
+        is("mailsub"));
+  }
+
+  @Test
+  @DisplayName("Given we search a user by a mail that does not exist, " + "no user should be given")
+  public void getNoneExistingUserByMailTest() {
+    assertThat(
+        "Should not get a user",
+        ldapReaderStore.getUserByMail("notexistingmail@insee.fr").isEmpty(),
+        is(true));
+  }
+
+  @Test
+  @DisplayName("Given several users have the same mail, " + "an exception should be raised")
+  public void getConflictingMailUserTest() {
+    assertThrows(
+        MultipleUserWithSameMailException.class,
+        () -> ldapReaderStore.getUserByMail("conflictingmail@insee.fr"));
+  }
 }
diff --git a/sugoi-api-ldap-store-provider/src/test/resources/ldap.ldif b/sugoi-api-ldap-store-provider/src/test/resources/ldap.ldif
index 11d46ee0..f3b6b2ae 100644
--- a/sugoi-api-ldap-store-provider/src/test/resources/ldap.ldif
+++ b/sugoi-api-ldap-store-provider/src/test/resources/ldap.ldif
@@ -397,6 +397,61 @@ pwdReset: false
 uid: havepwdreset
 cn: havepwdreset
 
+dn: uid=mail1,ou=contacts,ou=clients_domaine1,o=insee,c=fr
+objectClass: top
+objectClass: inseeCompte
+objectClass: inseeContact
+objectClass: inseeAttributsAuthentification
+objectClass: inseeAttributsHabilitation
+objectClass: inseeAttributsCommunication
+uid: mail1
+cn: mail1
+mail: userwithuniqueemail@insee.fr
+
+dn: uid=mailsub,ou=contacts,ou=clients_domaine1,o=insee,c=fr
+objectClass: top
+objectClass: inseeCompte
+objectClass: inseeContact
+objectClass: inseeAttributsAuthentification
+objectClass: inseeAttributsHabilitation
+objectClass: inseeAttributsCommunication
+uid: mailsub
+cn: mailsub
+mail: userwithsubemail@insee.fr
+
+dn: uid=mailext,ou=contacts,ou=clients_domaine1,o=insee,c=fr
+objectClass: top
+objectClass: inseeCompte
+objectClass: inseeContact
+objectClass: inseeAttributsAuthentification
+objectClass: inseeAttributsHabilitation
+objectClass: inseeAttributsCommunication
+uid: mailext
+cn: mailext
+mail: extuserwithsubemail@insee.fr
+
+dn: uid=mailconflict1,ou=contacts,ou=clients_domaine1,o=insee,c=fr
+objectClass: top
+objectClass: inseeCompte
+objectClass: inseeContact
+objectClass: inseeAttributsAuthentification
+objectClass: inseeAttributsHabilitation
+objectClass: inseeAttributsCommunication
+uid: mailconflict1
+cn: mailconflict1
+mail: conflictingmail@insee.fr
+
+dn: uid=mailconflict2,ou=contacts,ou=clients_domaine1,o=insee,c=fr
+objectClass: top
+objectClass: inseeCompte
+objectClass: inseeContact
+objectClass: inseeAttributsAuthentification
+objectClass: inseeAttributsHabilitation
+objectClass: inseeAttributsCommunication
+uid: mailconflict2
+cn: mailconflict2
+mail: conflictingmail@insee.fr
+
 dn: uid=testo,ou=organisations,ou=clients_domaine1,o=insee,c=fr
 objectClass: top
 objectClass: inseeOrganisation