One of my friend told me he not received email from his relatives since 2 days ago. He guess maybe there was an error in our mail server.
So, I use my gmail account and send an email to one of my company mail account. Gmail can't send email, here the report :
This is an automatically generated Delivery Status Notification
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
PERM_FAILURE: SMTP Error (state 14): 554 Service unavailable; Client host [188.8.131.52] blocked using relays.ordb.org; ordb.org was shut down on December 18, 2006. Please remove from your mailserver.
It said we must remove relays ordb.org from our mailserver. My company using postfix as mail server.
[email protected]:~$ sudo vi /etc/postfix/main.cf
smtpd_recipient_restrictions = permit_mynetworks,
Remove the 'reject_rbl_client relays.ordb.org' line or we can deactivate it. And now the problem are fix. :)