I followed the post-by-email directions in the codex: I set up a new email address (email@example.com), I entered the incoming mailserver (mail.mydomain.com), port 110, "secretaddress" and password in the "writing" section in my wordpress account.
I also added an editor account for my blog. I can send emails from the editor email address to firstname.lastname@example.org, and the emails are received. But, when I went to check http://mydomain.com/installdir/wp-mail.com, all i got is an "oops, this is embarrasing, we can't find the page you're looking for" error message.
So after reading through the forum, I tried http://mydomain.com/wp-mail.com (without the installdir). Now I get either
POP3 connect: Error  [Connection timed out]
or the "slow down cowboy" error message.
I have tried changing my incoming server to ssl://mail.mydomain.com but it doesn't change anything.
Any idea what I might be doing wrong?
I'm using version 3.4.2.