[horde] Improving ActiveSync speed on large mailboxes

[Torben Dannhauer]

There are some ideas, let me finish first the streaming topic and get things stable for all different scenarios you guys are fighting with, then let’s work on speed improvement


Von unterwegs gesendet
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> Am 13.07.2026 um 17:42 schrieb Sebastian Arcus <s.arcus at open-t.co.uk>:
> 
> If you could bear with me a little as this is a subject I know very little about. On IMAP, one feature which really helps with very large mailboxes, specially on mobile clients, is the ability to download only the headers and only request the email body when the actual email is opened on the devices.
> 
> I gather (if my research is correct) that EAS doesn't have a direct equivalent. Instead it relies on the client requesting how much of the email body it wants to receive via the TruncationSize parameter.
> 
> I also gather (if this is correct), that there is no way to configure this parameter in the Gmail app on Android. Looking at the ActiveSync logs, it seems Gmail requests by default 200000 (byes, I assume?). I wonder if it would be feasible at all to have a configurable override in Horde, in the ActiveSync section - something like "override_truncationsize" - to be able to set this to zero - and thus force the client to only download the headers. I think this might speed up considerably loading of large mail folders - and save quite a bit of storage space on client devices as well.
> 
> As it stands at the moment, I find downloading of large Inboxes over EAS very slow compared to IMAP.
> 
> However, I have no idea if the above is at all feasible and workable within the limits of the EAS protocol?
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