diff -up dovecot-2.2.19/dovecot.service.in.waitonline dovecot-2.2.19/dovecot.service.in
--- dovecot-2.2.19/dovecot.service.in.waitonline	2015-10-05 12:51:42.578391891 +0200
+++ dovecot-2.2.19/dovecot.service.in	2015-10-05 12:53:20.143907826 +0200
@@ -24,6 +24,7 @@ After=local-fs.target network.target
 
 [Service]
 Type=simple
+ExecStartPre=/usr/libexec/dovecot/prestartscript
 ExecStart=@sbindir@/dovecot -F $OPTIONS
 ExecReload=@sbindir@/dovecot reload
 PrivateTmp=true