On 21.09.2014 18:16, Richard wrote:
> Ports 993 and 995 are imaps and pop3s respectively. They use an
> encrypted data transport.
>
> Ports 143 and 110 are (unencrypted) imap and pop respectively.

Nowadays most providers support STARTTLS to upgrade initially
unencrypted IMAP/POP/SMTP sessions. So it's perfectly fine to use IMAP
with port 143, as long as STARTTLS is selected under 'Security' in K-9
Mail. The same goes for POP3 and SMTP. All relevant information will be
encrypted this way.

-cketti

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