diff --git a/charts/dbildungs-iam-ldap/values.yaml b/charts/dbildungs-iam-ldap/values.yaml
index fda991f..82e41e8 100644
--- a/charts/dbildungs-iam-ldap/values.yaml
+++ b/charts/dbildungs-iam-ldap/values.yaml
@@ -95,11 +95,28 @@ pdb:
 # Custom openldap schema files used to be used in addition to default schemas
 # Note that the supplied files are sorted by name and inserted into 'LDAP_EXTRA_SCHEMAS' env var
 # after chart default schemas, allowing you to control the loading sequence.
-# customSchemaFiles:
-#   custom.ldif: |-
-#     # custom schema
-#   anothercustom.ldif: |-
-#     # another custom schema
+customSchemaFiles:
+  ucs_mail.ldif: |-
+    dn: cn=ucsMail,cn=schema,cn=config
+    objectClass: olcSchemaConfig
+    cn: ucsMail
+    olcAttributeTypes: ( 1.3.6.1.4.1.10176.1010.1.41 NAME 'univentionCanonicalSenderRewriteEnabled'
+     DESC 'rewrite sender addresses?' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{10} SINGLE-VALUE )
+    olcAttributeTypes: ( 1.3.6.1.4.1.10176.1010.1.42 NAME 'univentionCanonicalRecipientRewriteEnabled'
+     DESC 'rewrite recipient addresses?' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{10} SINGLE-VALUE )
+    olcAttributeTypes: ( 1.3.6.1.4.1.10176.1010.1.43 NAME 'univentionInternalPrimaryMailAddress' 
+     DESC 'primary mail address of user' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256} SINGLE-VALUE )
+    olcAttributeTypes: ( 1.3.6.1.4.1.10176.1010.1.44 NAME 'univentionInternalAlternativeMailAddress' 
+     DESC 'additional mail addresses' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256}
+     )
+    olcAttributeTypes: ( 1.3.6.1.4.1.10176.1010.1.45 NAME 'univentionPublicPrimaryMailAddress' DESC 'public mail address of user' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256} SINGLE-VALUE )
+    olcAttributeTypes: ( 1.3.6.1.4.1.10176.1010.1.46 NAME 'univentionPublicAlternativeMailAddress' DESC 'additional mail addresses' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256} )
+    olcObjectClasses: ( 1.3.6.1.4.1.10176.1010.2.40 NAME 'univentionMailCanonicalMaps' 
+     DESC 'data for rewriting mail addresses'
+     SUP top 
+     AUXILIARY MAY ( univentionCanonicalSenderRewriteEnabled $ univentionCanonicalRecipientRewriteEnabled $ univentionInternalPrimaryMailAddress $ univentionInternalAlternativeMailAddress $ univentionPublicPrimaryMailAddress $ univentionPublicAlternativeMailAddress ) )
+
+
 
 
 # Custom openldap configuration files used to override default settings