What is a domain name?
What makes a domain name?
The domain name is the name used to find the website on the Internet, which is an important identifier on the Internet, which is equivalent to the house number of the host.
Each host corresponds to an IP address, and each IP address consists of a series of numbers, such as 101.25.11.34. People use people to make memories
Domain names replace these numbers to find hosts, such as Mydomain.com. Each domain name and the IP address are one or one, and people enter the domain name, and then resolved into IP addresses by the Domain Name Server (DNS) to find the corresponding website. Every URL and Email use the domain name. In English international domain name, the domain name can be in English letters and Arabic numbers and horizontal bars, "-", up to 67 characters (including suffix), and the case of the letter does not distinguish, each hierarchical cannot exceed 22 letter. In the domestic domain name, the length of the three domain name must not exceed 20 words.
What is DNS?
Domain management system DNS (Domain
Name
System is the meaning of domain name resolution server. It is in the Internet that converts domain names into IP addresses that can be identified in the network. For example: WWW.163.Com entered when we online will be automatically converted into 202.108.42.72
What is a record?
A
(Address)
The record is used to specify the IP address record corresponding to the host name (or domain name). Users can point to website servers under this domain to their own Web
SERVER. You can also set the secondary domain name of your domain name.
What is NS record?
NS (name
Server) Record is a domain name server record that specifies which DNS server is analyzed by this domain name.
What is an alias record (CNAME)?
Also known as a standard name. This record allows you to map multiple names to the same computer.
It is usually used to provide a computer that provides both WWW and MAIL services. For example, there is a computer name "host.mydomain.com" (a record).
It offers WWW and MAIL services, in order to facilitate user access services. Two alias (CNAME) can be set for the computer: WWW and MAIL.
The full name of these two alias is "www.mydomain.com" and "mail.mydomain.com". In fact, they all point to "Host.Mydomain.com".
What is generic domain name resolution?
The general domain name resolution is defined as:
The customer's domain name A.com, which is set to the same IP address below the * .a.com.
For example, customers set up B.A.com, they will automatically resolve to the same IP address with A.com.
What is MX record?
MX (Mail
Exchanger) Record is a mail exchange record, which points to a mail server, according to the email system
The address suffix of the recipient will locate the mail server. For example, when a user on the Internet wants to send a letter
User@mydomain.com
When the user's mail system looks for MX records of mydomain.com this domain name by DNS, if the MX record exists,
The user computer sends the message to the MX record specified on the mail server specified.
Check if the MX log
A very useful tool for performing DNS queries is NSLookup, which can use it to query various data in DNS. You can run NSLookup directly in Windows command line to enter an interactive mode where you can query various types of DNS data.
DNS's name parsing data can have a variety of different types, with SOA type data for setting this zone parameter, with a type A-type data for the IP address corresponding to the name, with MX type data for setting mail exchange. These different types of data can be queried by Nslookup's interactive mode, and set in the query process
The TYPE command sets the corresponding query type.
Such as:
C: /> nslookup
DEFAULT
Server:
[202.106.184.166]
Address:
202.106.184.166
>
set
TYPE = MX
>
sina.com.cn
DEFAULT
Server:
[202.106.184.166]
Address:
202.106.184.166
Non-authoritative
Answer:
sina.com.cn
MX
Preference
=
10,
Exchanger
=
sinamx.sina.com.cn
sina.com.cn
Nameserver
=
ns1.sina.com.cn
sina.com.cn
Nameserver
=
ns3.sina.com.cn
sinamx.sina.com.cn
internet
Address
=
202.106.187.179
sinamx.sina.com.cn
internet
Address
=
202.106.182.230
ns1.sina.com.cn
internet
Address
=
202.106.184.166
ns3.sina.com.cn
internet
Address
=
202.108.44.55
If the MX record of a domain name to be found does not exist, then a prompt is displayed with the following:
C: /> nslookup
>
set
TYPE = MX
>
AMAXIT.COM.CN
DEFAULT
Server:
[202.106.184.166]
Address:
202.106.184.166
***
202.106.184.166
can't
Find
Amaxit.com.cn:
Non-existent
Domain
Use your own domain name in the mail system
Suppose your mail server address is:
61.176.1.120
A record has been built:
Mail.mydomain.com
A
61.176.1.120
For the case where MX record already exists
If the MX record already exists and has been checked on a domain name server, the job you need to do is to contact your domain name service provider or the administrator of the domain server, and modify the MX record as follows:
Your domain name
In
MX
10
Mail.mydomain.com
Situation for MX records
To figure out that your domain is exactly the domain name in which domain name server (DNS) is analyzed, there are two ways to check the relevant application information submitted when you register the domain name, and get the unit, and The unit contact for the acceptance, letting the other person's related personnel will help you find out; the other is in WinNT, Win2000, or various UNIX operating systems, by using NSlookup.
Once you have found your domain name, please contact your domain service provider or the administrator of the server, so that the other party adds a MX record for you, the form of the record is as follows:
Your domain name
In
MX
10
Mail.mydomain.com
Only if the hostname can build a mail system?
absolutely okay. Suppose your mail server's host name is
Mail.mydomain.com, that is, in the Internet, Mail.Mydomain.com resolves to your mail server IP address. You can build a call in your mail system
Mail.mydomain.com's domain, your Email format is
User1@mail.mydomain.com,
Other mail systems can be sent to your server and use the dynamic domain name to point to the same. If you have a static IP address, you can even build an IP address as the end of the mail system.
There is also a situation that your domain directly points to your mail server, that is, in the Internet, MYDOMain.com resolved to your mail server, then build a mydomain.com domain,
Your email format is
User1@mydomain.com
What is RBL?
RBL
Full name
Real-time
Blackhole
Lists,
It is the service provided by the anti-spam organization provided by foreign anti-spam organizations.
RBL
The function is almost unavailable for Chinese users.
Because we found that most China's IP address is
RBL
Database. Please do not enable RBL
Features.
Common RBL server addresses are:
RELAYS.RDB.ORG DNSBL.NJABL.ORG BL.SPAMCOP.NET SBL.SPAMHAUS.ORG DUN.DNSRBL.NET DNSBL.SORBS.NET
Query and delete IP addresses in RBL, please http://openrbl.org/
with
http://ordb.org
