additional home urls

Hi

we are using your plugin on our website.

we have domain domin.me
and we use m.domain.me for mobile devices.

In additional home urls field we entered following domains in this way:
http://www.domain.me
http://domain.me
http://m.domain.me
http://www.m.domain.me

but cache is only purged from url from which is accessed.
For example if cache is purged from url http://domain.me everything is fine but on http://www.domain.me / m.domain.me and http://www.m.domain.me is not appearing new content…

Regards!