I currently have a 2Gb personal maildir quota, and I'm currently using 1Gb. I use IMAP. Full IMAP subfolder queries ("check all folders for new mail", etc...) are a CPU hog for large mailboxes, and changing your filesystem isn't going to help that much. For those of you familiar with Big-O notation, I believe it's a O(N) operation for the number of folders under your INBOX. If it's too slow, get a bigger CPU, or more of them (think cluster).

Hi all, I had the same problem: a mailbox with 260.000 messages that killed the server when opened in IMAP. I use RH with ext3.

I made some tests formatting a partition with Reiserfs (3) under Linux RH 9 and
moving the maildir there.

There is no a real increase in performance from ext3 to Reiserfs when you
handle such maildirs.

Better looking for a faster disk or a faster machine.

Fabrizio Frosali
Impulso Srl
Dedicated Mail Servers

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