diff -up dovecot-2.1.10/dovecot.service.in.privatetmp dovecot-2.1.10/dovecot.service.in
--- dovecot-2.1.10/dovecot.service.in.privatetmp	2012-11-02 10:27:38.000000000 +0100
+++ dovecot-2.1.10/dovecot.service.in	2012-11-02 10:28:04.079320857 +0100
@@ -6,6 +6,7 @@ After=local-fs.target network.target
 Type=simple
 ExecStart=@sbindir@/dovecot -F
 ExecReload=/bin/kill -HUP $MAINPID
+PrivateTmp=true
 NonBlocking=yes

 [Install]