From mboxrd@z Thu Jan 1 00:00:00 1970 From: dwmw2@infradead.org (David Woodhouse) Date: Wed, 11 Aug 2010 16:58:25 +0100 Subject: Query: Patches break with Microsoft exchange server. In-Reply-To: <4C62C5BD.3020808@mnsu.edu> References: <4C5F9B25.8080401@st.com> <4C624AE1.30504@st.com> <4C62C5BD.3020808@mnsu.edu> Message-ID: <1281542305.5107.11.camel@localhost> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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. > Sigh.... 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. http://git.gnome.org/browse/evolution-data-server/commit/?id=9714c064 -- David Woodhouse Open Source Technology Centre David.Woodhouse at intel.com Intel Corporation