Tunning for large number of files in INBOX

[Joel Nimety]

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Hello,

I'm trying to set up cyrus-imap as a backend for an email archiving
solution.  I'm creating one account on the imap server for each customer
  domain(s) we'll be archiving mail for.  I'm concerned that the number
of emails that will end up in each INBOX will reach some limit (ext3 fs
limit, practical limit, etc.)

Is there a way I can have cyrus hash the files within the INBOX
directories into sub directories? If this isn't possible does anyone
have a sieve script that can sort mail into folders by date?  Any help
is much appreciated.

Thanks.

Joel Nimety
Perimeter Internetworking Corp.
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