On 01/14/2016 09:22 PM, @lbutlr wrote:

Error: mmap() failed with file /home/user/Maildir/.Archive/dovecot.index.cache: Cannot allocate memory

I have default_vsz_limit = 512 M in my conf file.

(This error only occurs with a single user’s .Archive index, but that user has over 400,000 files int eh Archive mailbox)

If you legitimately have such huge mailboxes, the only thing you can really do is increase the VSZ limit or disable it entirely.