Is there a way to test to see if a specific RBL is active and responding? We had orbs.dorkslayers.com listed as one of our RBLs in our smtpd_recipient_restrictions section only to find out last week that this specific RBL was no longer valid.
I have since reviewed our other listed RBLs and found the following ones in our configuration which do not resolve on DNS lookups: spews.relays.osirusoft.com socks.relays.osirusoft.com dialups.relays.osirusoft.com pamsites.relays.osirusoft.com spamhaus.relays.osirusoft.com sbl.spamhaus.org proxies.relays.monkeys.com bl.spamcop.net list.dsbl.org Since these hosts do not resolve with DNS lookups, does this mean they are offline and no longer functional? ## Here is another odd nslookup. When I do a nslookup on relays.osirusoft.com using our name servers (a FreeBSD one and a Win32 one), I get only 1 IP listed (168.103.238.114). However, if I perform the same lookup using any other name server, I get 6 IPs listed (168.103.21.153, 168.103.21.154, 168.103.21.155, 168.103.238.113, 168.103.238.114, 168.103.238.115). I checked the SOA record and the serial number on our name servers match the serial number on the other name servers I used. Why is this happening? ## Leo A. Novelli Atlantis International, LLC
