lost connection with hostname[private/dovecot-lmtp]

Hi,

It's christmas eve and I've spent hour trying to solve this damn prob with my mail server.

I am able to send emails from my new email address, but I'm not able to receive them, instead I get this error in my mail.log

> lost connection with hostname[private/dovecot-lmtp] while receiving the initial server greeting)

I've followed this guide step by step on an Ubuntu 12.04 Linode, but yet nothing I try works and I really have no experience in this software to mess around to much.

If anyone knows how I can fix this I would be super grateful.

Thanks and happy christmas

Simon