insufficient system storage

Здравствуйте
помогите с проблемой:

% grep insuffi 2006-05-15.log

00:53:58.01 1 SMTP-02984(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
01:53:58.01 1 SMTP-03009(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
02:53:58.01 1 SMTP-03012(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
03:53:58.01 1 SMTP-03120(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
04:53:58.02 1 SMTP-03132(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
05:53:58.01 1 SMTP-03134(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
06:53:58.02 1 SMTP-03136(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage
07:53:58.01 1 SMTP-03153(*) [776508] return-path rejected, got:452 4.3.0 Requested action not taken: insufficient system storage

при этом
% df -hi .

Filesystem     Size    Used   Avail Capacity iused   ifree %iused  Mounted on
/dev/da2s1d     66G    3.0G     58G     5%    1421 8971889    0%   /opt/storage

в чем может быть дело?

-- 
С уважением,
В.Ю. Сухих              mailto:suh@udmene.ru