Blacklisted server not being correctly identified.
- GFI MailEssentials
- All supported environments
To check if your DNS server is configured correctly for queries made by the DNS Blacklist feature, you need to do the following:
- Open command prompt
- Type nslookup
- Type set q=txt
- Type set timeout=10
- Type 18.104.22.168.bl.spamcop.net (the real ip address in this case is 127.0.0.2)
If you get:
- Blocked - see http://www.spamcop.net/bl.shtml?127.0.0.2 then the DNS server is configured correctly.
- Non-existent domain then the ip address is not in the DNSBL list.
- DNS request timed out then the DNS server is not configured correctly
The DNSBL is totally dependent on the DNS server configured on the local machine. If this is not configured correctly, you will get strange results or time outs from the DNSBL feature. In such cases, inbound emails may take a long time to be delivered, since GFI MailEssentials will have to timeout on each DNS request that is made.