I had a customer with an INBOX cache of 400MB+ (5.5GB maildir) which gave me "Error: mmap_anon(474165248) failed: Cannot allocate memory" errors, then I deleted the cache files and ran 'doveadm index -u xxx@example.com "*"', now the INBOX cache is 7MB

What is up with that? Is the cache now missing something or does it make sense to wipe cache files and reindex cache every-so-often?

-- Tom