I can't import emails horde

[futurosoft]

Hello.

I can't import emails in Horde. My file ".mbox" have a size of 250 MB. The log of horde said me:

2014-11-02T23:04:52+00:00 DEBUG: HORDE [horde] SQL  (0,0003s)
  SELECT alarm_id, alarm_uid, alarm_start, alarm_end, alarm_methods,
  alarm_params, alarm_title, alarm_text, alarm_snooze, alarm_internal
  FROM horde_alarms WHERE alarm_dismissed = 0 AND ((alarm_snooze IS NULL
  AND alarm_start <= '2014-11-02 23:04:52') OR alarm_snooze <=
  '2014-11-02 23:04:52') AND (alarm_end IS NULL OR alarm_end >=
  '2014-11-02 23:04:52') AND (alarm_uid IS NULL OR alarm_uid = '' OR
  alarm_uid = 'my@email.com') ORDER BY alarm_start, alarm_end [pid 16252 on line 208 of "/usr/share/psa-pear/pear/php/Horde/Db/Adapter/Pdo/Base.php"]
2014-11-02T23:04:52+00:00 DEBUG: HORDE [horde] Max memory usage: 4980736 bytes [pid 16252 on line 618 of "/usr/share/psa-pear/pear/php/Horde/Registry.php"]

How can i solved? Very thanks!