Hi. With all the excitement lately about memcached and ddos attacks, perhaps memcached should be installed to use unix domain sockets. As far as I know, the only reason memcached is on my iredmail server is to support SOGo. So I made these changes (on FreeBSD): sysrc memcached_flags="-s /var/run/memcached/memcached.sock -a 0666"
In /usr/local/etc/sogo/sogo.conf SOGoMemcachedHost = "/var/run/memcached/memcached.sock";
Now memcached does not listen on any network port. Unix domain sockets usually perform faster than TCP, also.