Thank you for you asnwers fast.
I check the logs and this appears:
In maillog
Apr 10 04:00:07 mail zimbramon[3684]: 3684:info: 2008-04-10 04:00:01, STATUS: mail.interforest.com.pe: mta: Stopped
Apr 10 04:00:07 mail amavis[3674]: No decoder for .lha tried: lha
Apr 10 04:00:07 mail zimbramon[3684]: 3684:info: 2008-04-10 04:00:01, STATUS: mail.interforest.com.pe: snmp: Running
Apr 10 04:00:07 mail amavis[3674]: No decoder for .cab tried: cabextract
Apr 10 04:00:07 mail zimbramon[3684]: 3684:info: 2008-04-10 04:00:01, STATUS: mail.interforest.com.pe: spell: Running
Apr 10 04:00:07 mail amavis[3674]: No decoder for .tnef tried: tnef |