Hello, my server (ZCS 6.0.6 on Ubuntu 8.04) has suddenly stopped querying DNSBL after working correctly for 10days.
Before yesterday I could see lines in the zimbra.log like the following ones:
Client host [220.127.116.11] blocked using zen.spamhaus.org;
Client host [18.104.22.168] blocked using cbl.abuseat.org;
I could also see that everything was fine using 'dnsblcount' ( dnsblcount - Count RBL Rejections in Postix Log ) with counters increasing in number
Here are the mta settings ( I changed zen.spamhaus.org to sbl.spamhaus.org):
zimbraMtaRestriction: reject_rbl_client sbl.spamhaus.org
zimbraMtaRestriction: reject_rbl_client dnsbl.njabl.org
zimbraMtaRestriction: reject_rbl_client cbl.abuseat.org
zimbraMtaRestriction: reject_rbl_client bl.spamcop.net
zimbraMtaRestriction: reject_rbl_client dnsbl.sorbs.net
To troubleshoot I configured zen.spamhaus.org on the firewall and it works there. Another weird thing about this DNSBL is that i can't ping it from the server while I can from a Windows client.
I can ping the other DNSBL both from the server and the windows clients. The server has bind9 installed
What could be causing the problem? Do you have an idea?