Query: Patches break with Microsoft exchange server.
jeffrey.hundstad at mnsu.edu
Wed Aug 11 12:16:50 EDT 2010
On 08/11/2010 10:58 AM, David Woodhouse wrote:
> On Wed, 2010-08-11 at 10:46 -0500, Jeffrey Hundstad wrote:
>> Exchange 2010 does not handle IMAP "chunking" (partial message transfer)
>> correctly. Any request after about 1 megabyte of total message size
>> will fail.
>> Thunderbird uses this "chunking" feature to give you a status update
>> while downloading large messages. The IMAP statements are of this type:
>> 11 UID fetch 244477 (UID RFC822.SIZE BODY<20480.12288>)
>> When the 20480 is larger than 1MB Exchange "claims" there is no more.
> I think the problem is not with the fetching -- the problem is that
> Exchange lies about RFC822.SIZE before the IMAP client even starts to
> fetch the message. It reports a size which is smaller than the actual
> size of the message, thus leading to truncated fetches.
> In Evolution we have a workaround -- we don't just stop when we get to
> the reported RFC822.SIZE; we continue fetching more chunks until the
> server actually stops giving us any more. It's not as efficient (because
> we fall back to having only one more chunk outstanding at a time rather
> than the normal three in parallel), but at least it works around this
> brokenness of Exchange.
In either case it can be used successfully by disabling
mail.server.default.fetch_by_chunks in Thunderbird.
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