[Dovecot] Purging old mails

Hi all,

Firstly if this is a FAQ and I've missed it - let me apologise in advance.

I use dovecot as a backup mail store and would now like to purge all mails over a certain age.

Is it as simple as using find and rm'ing the results or is there more to it?

I'm using maildir if that make a difference?

Thanks in advance.

Daveh