SMTP Server sends mails from local host to the recipients' mailboxes directly at an amazingly high speed and get feedback instantly!

It needs use the DNS server to resolve the domain name of the recipients' address when directly

deliver, so please input valid DNS servers in "User DNS Servers", Each lines matches with one DNS

server address, and the lines are not limited on quantity. The premier DNS server will be used firstly,

so please put faster and steadier one in the front.

If you don't input DNS Server or User DNS servers are all invalid, QK SMTP Server will use the

default System DNS Servers to resolve E-mail address.