Hi,
i checked the pop3 thingie as far as I could see, it works.
http://www.lippe-in-nrw.de/cgi-bin/pop3checker/pop.cgi
But i also saw that nova activated grey listing, this causes a delay of 3 - 15 minutes, for untrustetd sender IP's. But no mail gets lost (unless the oponent side does not retry at all, which ist only known for spam sending software).
I will urge him to disable it, I personaly do not like the idea of artificial delays (which will be dealt with best by spam software, just give them a few month. -> see the story of SPF -> most domains having SPF records are SPAMING domains and even Spamassasin does not trust SPF records much)
--OK