Am 16.09.2013 16:48, schrieb Dan Langille:
On Sep 16, 2013, at 10:21 AM, Reindl Harald wrote:
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
I believe I do understand.
Yes, that's what I those STARTTLS was.
if you turn off SSL it is turned off on sane clients like thunderbird you can switch between cleartext/STARTTLS and SSL
So far, with all we've tried, the only secure option appears to be self signed certificates
having like here since 2009 a Thawte certificate for SMTP/POP3/IMAP/HTTPS without any issue is the better option because it is accepted by *any* client and not *that* expensive
dealing with self-signed certificates is *plain wrong* because you educate your users happily confirm SSL warnings in their clients and having the final result of this in mind it's better not offer SSL at all