Am 16.09.2013 16:10, schrieb Dan Langille: >> Have you/they tried simply using TLS on 143? (preferred as POP3s/IMAPs >> has really be deprecated everywhere for some time now) > > For this test, I reconfigured the server to NOT use IMAPS and restarted it. > Then I went > to my iPhone and turned off SSL for this mail account. > > That configuration works for my iPhone. > > Looking via tcpdump, I can see that emails are indeed being downloaded in > clear text
you need to understand the difference between IMAPS/POP3S on the dedicated 9xx ports versus STARTLS on 143/110 http://en.wikipedia.org/wiki/STARTTLS if you turn off SSL it is turned off on sane clients like thunderbird you can switch between cleartext/STARTTLS and SSL
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