I've since discovered on superuser.com that apparently under pop3 protocol. 
if an email client retrieves messages from the server (but leaves a copy on 
the server) this causes messages on the server to be marked as read. 
(Thanks to superuser member JdeBP for this enlightenment.)
So it's nothing to do with K-9, just my misunderstanding of pop3. ... 
thought I'd better mention that. :-) (If only I'd read RFCs 1081 and 1939 
before I posted. <sigh>)


On Saturday, 5 December 2015 14:42:07 UTC+10, Roger V. wrote:
>
> Greetings,
> I've got K-9 version 5.006 set up to fetch mail from 3 accounts using 
> pop-3 protocol (not IMAP) . Needless to say, I think it's great, except for 
> the above mentioned problem. How I'd expect it to work is to fetch mail 
> from the server, and allow me to read it locally without affecting the 
> server messages, so my wife can read the emails using a web mail interface, 
> and keep track of what she's read and not read independently of me. 
> Instead, she's alerted me to the fact that they were being marked as read. 
> I traced this to my phone and K-9 marking them as read on the server each 
> time I retrieve them.
> As I said, K-9 appears to be set up as pop-3, not IMAP, and from what I've 
> read about pop-3 it can't mark messages on the server as read. (Hope the 
> Westnet tech was correct on that score....)
> If this is a feature, how can I turn it off?
> Thanks in advance for your help,
> Roger.
>

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