[Dovecot] save failed to INBOX: Not enough disk space

Hi I migrated to dovecot 2 and I started using lmtp for mail delivery.

But I have found this on my logs "save failed to INBOX: Not enough disk space" .

There is enougth space on disk. and I am not using quota plugin on lmtp

my lmtp conf is as follow:

# ## LMTP specific settings ##

# Support proxying to other LMTP/SMTP servers by performing passdb lookups. #lmtp_proxy = no

# When recipient address includes the detail (e.g. user+detail), try to save # the mail to the detail mailbox. See also recipient_delimiter and # lda_mailbox_autocreate settings. #lmtp_save_to_detail_mailbox = no

protocol lmtp { # Space separated list of plugins to load (default is global mail_plugins). #mail_plugins = $mail_plugins mail_plugins = sieve postmaster_address = admin@domain.tld }

Any idea please?

Thanks