Ok, so since it worked in 1.8.1 and just stopped working on that version all of a sudden it will most likely be due to your imap settings, only other case would be if you made modifications to epesi core, which from what I understand you did not, so it has to be your imap settings. We can help you with this but we would need access to your server, you can get help from our premium support team http://telaxus.com/premium-support
