diff -up dovecot-2.2.19/dovecot.service.in.privatetmp dovecot-2.2.19/dovecot.service.in
--- dovecot-2.2.19/dovecot.service.in.privatetmp	2015-10-05 12:50:24.273780394 +0200
+++ dovecot-2.2.19/dovecot.service.in	2015-10-05 12:50:56.281621589 +0200
@@ -26,6 +26,7 @@ After=local-fs.target network.target
 Type=simple
 ExecStart=@sbindir@/dovecot -F $OPTIONS
 ExecReload=@sbindir@/dovecot reload
+PrivateTmp=true
 NonBlocking=yes
 
 [Install]