The IP addresses to use as name servers. If this is empty the application will default to using the
Use TCP instead of UDP for DNS queries. UDP is faster, but is limited in size. DNS lookups will automatically use TCP for zone transfers (AFXR) and when a response was truncated.
Sctrict query mode
If the hostname that was looked up is not actually in the answer section of the response, the DNS lookup will return an empty answer section, instead of an answer section that could contain CNAME records.
Randomize name servers
Randomize the name servers list each time it is used.
The UDP/TCP port to use when making DNS queries.
Timeout value to use for socket connections (in seconds).
The type of cache to use.
The number of bytes the application is allowed to use as a DNS cache (in bytes)
The dns blacklists to use when performing DNS based blacklist checks.
Default: zen.spamhaus.org, bl.spamcop.net, b.barracudacentral.org , bl.score.senderscore.com, cidr.bl.mcafee.com, dnsbl.forefront.microsoft.com, bogons.cymru.com, scbl.abuseat.org, all.spamrats.com