[horde] ActiveSync: E-Mails show up several times on Android

[ich at sebmeyer.de]

Hi,

I am running Horde5 with Horde_ActiveSync-2.0.0beta4 on a fresh horde  
install (both pear packages and database).
The client is a Galaxy S2/Android with a CyanogenMod10 Nightly Build  
(at most a week old), reported as "Android/4.1.2-EAS-1.3" by Horde.
This is the first time I use both Horde5 and ActiveSync, so I have no  
experience with versions prior to 2.0.4beta4.
However, I needed to setup Horde multiple times, as I messed up some  
pear stuff. This included adding and removing my "exchange" account on  
my mobile several times, but the problem I describe in this mail did  
occur after using the final setup for a few hours.

Ok, enough prelude...

The issue I am having are random emails which display multiple times  
on the mobile.
It started with double mails, but later some mails are on the  
smartphone three to five times. But not all mails are affected. Maybe  
(or maybe not - I didn't keep track of the order of mails and spam I  
removed) there were some mails in between which I marked for deletion  
and later purged.

See the screenshot at  
http://dl.dropbox.com/u/18050942/Screenshot_2012-10-22-18-04-16.png
The two mails in that screenshot should be there only once, but the  
AWS Newsletter is there 3 times, and my Test mail even 5 times :(
In IMP and IMAP (checked against Roundcube) the AWS mail is found only once.

BUT the Test mail I sent myself [from the mobile] is found TWO times  
in my Inbox (in IMP and IMAP) - with the same "Message-ID" header  
field. I only saw this quite recently, so I can't tell whether it's  
been there ever since I sent it this morning or just since a few  
minutes. I am quite sure that IMP/ActiveSync produced that error, as I  
didn't use any other mail client until after noticing the double test  
mail.
As far as I can see this is the only double mail actually found in  
IMAP, so that might be a different (AS related) issue.

All I did was the usual e-mail usage - replying to mails and marking  
them as deleted both in Horde and on the mobile (sometimes my phones  
Edge/HSDPA internet connection wasn't stable), and purging mails  
marked for deletion in Horde (androids mail client either can't do  
that or I haven't found that function, yet).

I am not sure how to get (meaningful) debug for that issue, but if  
someone gives me a pointer I can try to get some output related to  
that problem.
Or maybe I overlooked something in the adb logcat & horde activesync  
debug outputs?
Any ideas for trials? Or maybe this is a known bug and everything will  
be fine with the next update? :)

Thanks,
Sebastian

P.S.: Creating an account for a developer and giving access to the  
relevant log files is no problem. Just in case you want to run some  
more complicated trials ;-)

P.P.S.: Horde5 looks pretty nice, I am looking forward to the first  
stable release :) Thanks for the effort and good work!