I have problems with pop3s. Sometime when I want to talk with pop3s I make connect to port 995 but that is all. No ssl starting, no negotiating or something else. Other services work correctly (smtp, imaps, https...). Its happening 3-5 times in day. The only way to solve this is to do zmmailboxctl stop && zmmailboxctl start. I use version 4.5.6_GA_1044.UBUNTU6.