First try posting by email

This is an attempt to post to my blog via email. If it works, then one postie cron job does the trick, otherwise I’ll have to set up a postie cron for each blog on the system… let’s find out!

Nope – to make postie work per wordpress install, you need a separate cron job to read each post. On the plus side, you can give each install a different periodicity and give infrequently updated instances a suitably infrequent check cycle.