[imp] Update - certain emails blocking ActiveSync on iPhones

[Michael J Rubinsky]

Quoting Sebastian Arcus <s.arcus at open-t.co.uk>:

> On 13/10/2021 00:59, Michael J Rubinsky wrote:
>>
>> Quoting Sebastian Arcus <s.arcus at open-t.co.uk>:
>>
>>> On 12/10/2021 20:54, Michael J Rubinsky wrote:
>>>>
>>>> Quoting Sebastian Arcus <s.arcus at open-t.co.uk>:
>>>>
>>>>> Further to my thread from a few weeks ago, this has started  
>>>>> happening on a second iPhone at the same site. Emails on this  
>>>>> iPhone have stopped syncing completely 4 days ago.
>>>>>
>>>>> This time, after the hints from Michael J Rubinsky, I've taken a  
>>>>> closer look at the inbox of the affected account on a computer,  
>>>>> and the email immediately after the last message which has  
>>>>> synced successfully on the phone has the following subject line:
>>>>>
>>>>> <<PR:63364>><<IR>> Site Inspection Report, Marshalswick, St Albans
>>>>>
>>>>> There were 7 emails with this subject line - part of a thread.  
>>>>> After moving them away from the inbox to another folder, the  
>>>>> sync resumed instantly on the iPhone.
>>>>>
>>>>> Is it possible that some characters in the subject line above  
>>>>> trip Horde, or the ActiveSync protocol somewhere? If I  
>>>>> reconfigure the iPhone to use imap, it syncs all messages of any  
>>>>> type, without complaints - so the issue seems to be somewhere  
>>>>> between ActiveSync, Horde and the Mail app on the phone.
>>>>
>>>> It could be anything to do with those emails, could be some  
>>>> memory limit being hit...could be lots of things. Unfortunately  
>>>> debugging EAS stuff is tough. I really can't look more into it  
>>>> without either a FULL activesync log - showing all the data, or  
>>>> copies of the emails so I can try to replicate the issue  
>>>> locally.  There are tons of things that can trip up activesync  
>>>> clients and we try to catch most of them (things like email  
>>>> headers with the wrong charset etc..).  Also, what version of PHP  
>>>> are you using?
>>>
>>> I have just sent you one of the emails suspected to cause the  
>>> ActiveSync issue.
>>>
>>> For the log - do I turn on ActiveSync logging per device - and  
>>> send you the log for this particular iPhone - or do you want a log  
>>> containing all the devices talking to the server?
>>
>> Use per device logging and I only need that one device's log during  
>> the time it issued a sync and retrieved the results that are  
>> failing.  If your version of horde has the option to enable  
>> "detailed" instead of "protocol" logging for the activesync log,  
>> please enable that too (I can't remember which version I introduced  
>> that in :)
>>
>>>
>>> This server has PHP 7.3.10
>>>
>>>
>>>>>
>>>>> Last time when this happened I also tried the Outlook app using  
>>>>> ActiveSync / Exchange on the iPhone - and that was even worse.  
>>>>> It refused to download any email. It kept on saying "There is no  
>>>>> email here" when checking the inbox.
>>>>>
>>>>> I thought maybe the above sheds a bit more light on this issue.  
>>>>> Please let me know if any further details are needed. I can  
>>>>> collect some debug logs, or forward the troublesome email in  
>>>>> full if that helps.
>>>>
>>>> Indeed, a copy of the email as well as a full log would be very  
>>>> helpful. You can forward them directly to my email address. I  
>>>> probably won't have time to look at them for another week or so  
>>>> though...
>
> I have sent you through:
>
> 1. A copy of the email which breaks the sync
> 2. A detailed log when the iPhone doesn't sync properly
> 3. A detailed log when the iPhone syncs emails properly (after  
> removing the problem email message from the inbox)
>
> Many thanks for looking into it


Hi Sebastian,

I took a look at this over the weekend and unfortunately I don't see  
anything really obvious. The 2 sample "bad" messages you pointed out -  
the Site inspection report email and the 'Re; RE: 65579...' email both  
sync fine for me on a number of iOS devices, as well as my Samsung  
Galaxy device.  One think I noticed was the '65579' email contains a  
TNEF attachment, which can sometimes cause issues if your horde server  
isn't setup to handle them correctly, but the other email you said was  
broken does not contain such an attachment.

I really didn't see anything in the logs you sent. The "Bad" log  
didn't even show any attempt at synchronizing the bad email that I  
could see. Did you look in the general horde log and/or the webserver  
log for any errors as well?





-- 
mike
The Horde Project
http://www.horde.org
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https://www.twitter.com/hordeproject
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