Create a digest email – by Number

Hi everyone,

My client wants to maintain a mailing list which will send out a regular ‘digest’ email of his posts. There are plugins to do this, but they all send mail out after a period of time has elapsed. My client says that since his posting is sporadic, he’d rather this email was sent out after he’s posted (say) 10 entries, rather than after a month elapses or a week. Can anyone recommend a good plugin to use as a starting point for this, or tell me if it would be comparatively easy to do?

I know that it will involve keeping a record of how many posts have been made since the last time the script was run, and this will obviously have to factor in edited/deleted posts. I could probably hack together something using php/CRON that could do it but I get the feeling that, this being WordPress, there’s a more elegant way.

Thanks,
Matt