Tickets :: Comment on [#12001] Courier - max atom size too small

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Comment	>> Why? > > Let me count the ways: > > 1. RFC 2683 was written in 1999. Back then, servers (both IMAP and > the underlying OS) weren't as robust/were 32-bit and had limited > memory/etc, etc. But now it is 2013 and there is zero reason, > performance or otherwise, to NOT allow something like this. Or, at > the very least, provide a much more reasonable command limit for > authenticated users (e.g. 100 KB). > 2. Regardless of #1, 2683 is informational and not part of the standard. > 3. What's more - there are now IMAP extensions that will be > completely broken if you limit the size of incoming data. For > example QRESYNC, since you MUST pass the entire known UID list at > SELECT/EXAMINE time. If you have thousands of UIDs in the local > cache, this is no longer possible (you can't break this up into > multiple commands). > 4. It is a significant performance penalty to have to break apart and > send these commands separately, especially since IMP does not > currently support pipelining. > >> i was trying to google it and it looks like i'm not able to set >> this in Courier. I don't know why exactly IMP requested so many >> messages but it happened automatically right after the login so i >> assumed it's not my fault. > > Because Courier is braindead and doesn't support SORT. So if you are > sorting by something other than arrival sort, we have to grab the > message data from every message in the mailbox to do the sorting on > the PHP side. > > I removed the code to prevent sorting on servers that don't support > this in IMP, but I think I probably need to add it back (Gmail > doesn't provide sort either). > >> Command line length limit in several IMAP servers (default values in bytes): >> Courier: 16384 (looks like cannot be changed) >> Dovecot: 65536 (can be set in config file) >> Cyrus: probably 131072 (can be set in config file) > > The latter 2 are a much more reasonable default on current machines, > while preventing DoS attacks.
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