To avoid running out of room on my mail server, I mounted a storage bucket
using FUSE and created a user with this as its home directory. To avoid
permissions issues, I used the arguments "allow_other" and
"default_permissions" and made sure my user owned its home directory. Even
after this, Postfix bounces my mail:
Status: 5.2.0
Diagnostic-Code: X-Postfix; maildir delivery failed: create maildir file
    /mnt/bucket/user/Mail/new/1495706489.V20I27M436672.server: Function not
    implemented

Dovecot also didn't work, here is the error it kept giving which might help:
server dovecot: imap(user): Error: close() failed with file
/mnt/bucket/user/Mail/dovecot.index.log: Input/output error

Do I have to make any configuration changes when using FUSE? Here's the
specific file system (if relevant):
https://github.com/GoogleCloudPlatform/gcsfuse



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