Product » Xeams » Knowledge Base
|Subject:||Importance of a DNS server in Xeams|
|Creation date:||9/12/16 5:21 PM|
|Last modified on:||2/20/17 11:59 AM|
Importance of a DNS server in Xeams
Selecting a faster DNS server is extremely important in Xeams. Several rules, such as RBL Lookups
Black-listed domain lookup
, MX, A, SPF lookup
run queries against a DNS server. Faster the lookups, faster Xeams will be able to process incoming messages.
By design, DNS servers create a lookup chain. For example, if a DNS server cannot resolve a query locally, it will
try getting that answer from the next server up. The more servers get involved in a lookup, the slower a result is fetched
and Xeams will spend a long time processing an email.
When it comes to DNS servers, bigger is better. Every DNS server will cache results. Therefore, it is always better to use
a DSN server that will have a large cache.
Often administrators use a local DNS server, running on their LAN. Relatively speaking, this local DNS server's cache will
be significantly less than the DNS server for your ISP.
Therefore, we strongly recommend using a DNS server belonging to your ISP instead of your router or another DNS server on your LAN.
DO NOT use a public DNS server, such as Googles (22.214.171.124). For some reason, Google's DNS server does not work nicely with RBL servers. Check this link on SpamHaus
Where to specify a DNS server
Although there is a way to specify a DNS server in Xeams, we recommend you change the DNS server at the machine level
where Xeams is running. That is because your machine also contains a cache and will make subsequent lookups faster.
Add a comment to this document
Do you have a helpful tip related to this document that you'd like to share
with other users? Please add it below. Your name and tip will appear at the
end of the document text.