diff --git a/pica-mail-mta/sasl-test/Dockerfile b/pica-mail-mta/sasl-test/Dockerfile
index 83d82f45cdc5bb654ac2b7e49ebf74f277240297..ea751b4f704840f3a081bdb1a361f9bde09d7b99 100644
--- a/pica-mail-mta/sasl-test/Dockerfile
+++ b/pica-mail-mta/sasl-test/Dockerfile
@@ -29,8 +29,8 @@ ENV LDAP_PORT 389
 ENV LDAP_BIND_DN cn=nss,dc=picasoft,dc=net
 ENV LDAP_BIND_PW rdonly
 ENV LDAP_SEARCH_BASE dc=picasoft,dc=net
-ENV LDAP_SASL_FILTER cn=%s
-ENV LDAP_VIRTUAL_MAILBOX_FILTER uid=%u
+ENV LDAP_SASL_FILTER cn=%u
+ENV LDAP_VIRTUAL_MAILBOX_FILTER uid=%s
 
 COPY saslauthd-postfix /etc/default/
 COPY entrypoint2.sh /