diff --git a/data/conf/sogo/sogo.conf b/data/conf/sogo/sogo.conf
index 65f5301f..9d04f0b5 100644
--- a/data/conf/sogo/sogo.conf
+++ b/data/conf/sogo/sogo.conf
@@ -26,7 +26,8 @@
     //  (domain3.tld, domain2.tld)
     // );
 
-    SOGoSieveServer = "sieve://dovecot:4190/?tls=YES";
+    // self-signed is not trusted anymore
+    SOGoSieveServer = "sieve://dovecot:4190/?tls=NO";
     SOGoSMTPServer = "postfix:588";
     WOPort = "0.0.0.0:20000";
     SOGoMemcachedHost = "memcached";