Hello folks,
Everything was going find until yesterday morning, the sever crash, so i restart the server and two or three hours later, the server crash again. No one was able to connect on zimbra, in my mail.log i got this kind of error, a lot and a lot of this error :

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zimbra postfix/smtpd[16131]: connect from unknown[59.161.151.123]
zimbra zmmailboxdmgr[25340]: status requested
zimbra zmmailboxdmgr[25340]: status OK
zimbra zmmailboxdmgr[25404]: status requested
zimbra zmmailboxdmgr[25404]: status OK
zimbra postfix/smtpd[16131]: lost connection after DATA from unknown[59.161.151.123]
zimbra postfix/smtpd[16131]: disconnect from unknown[59.161.151.123]
zimbra postfix/smtpd[16561]: connect from mx2.mail.account.com[128.8.70.43]
zimbra postfix/smtpd[16561]: disconnect from mx2.mail.account.com[128.8.70.43]
zimbra postfix/smtpd[16140]: connect from mail35.elabs3.com[208.66.204.135]
zimbra postfix/smtpd[16151]: connect from unknown[188.50.53.239]
zimbra postfix/smtpd[16147]: lost connection after DATA from unknown[189.115.187.78]
zimbra postfix/smtpd[16147]: disconnect from unknown[189.115.187.78]
zimbra postfix/smtpd[16151]: warning: 189.115.187.78: hostname 189.115.187.78.static.host.gvt.net.br verification failed: Name or service not known
zimbra postfix/smtpd[16151]: connect from unknown[189.115.187.78]
zimbra postfix/smtpd[16151]: NOQUEUE: reject: RCPT from unknown[189.115.187.78]: 550 5.1.1 <bridwell@my.account.com>: Recipient address rejected: my.account.com; from=<mtg@boldopinion.com> to=<bridwell@my.account.com> proto=ESMTP helo=<[189.115.187.78]>
zimbra postfix/smtpd[16151]: lost connection after DATA from unknown[189.115.187.78]
-------------------------------------------------

And two or three hours later... i restart zimbra with this command :
su - zimbra -c "zmcontrol start"

and i had this :

Starting ldap...Done.
Failed.
Failed to start slapd. Attempting debug start to determine error.
bdb_db_close: database "": txn_checkpoint failed: Invalid argument (22).
backend_startup_one (type=hdb, suffix=""): bi_db_open failed! (22)
bdb_db_close: database "": alock_close failed


Any hint where i can start my research, anyone can help me to resolve this ?

Thanks