Check domain name MX PTR (reverse parsing) records processing method _win Server

1 in Windows system, click the "Start" menu → "Run" → "input cmd" (Windows98 System for command), open the Windows system's MS-DOS interface. Enter the "nslookup" command to enter the domain name resolution interface.

2 Enter "Set Q=MX" to enter MX record query status
Enter the primary domain name of your company's mail server, which is the part after "@" for the user's mail address
such as: 163.com,china.com, etc.
This article takes china.com as an example to return the following approximate information (the Blue section is commented):

> China.com―― This is the primary domain of the query
server:ns-pd.online.sh.cn--This is the DNS host name that is currently in use
address:202.96.209.133--This is the DNS host address that is currently being used

Non-authoritative Answer:
china.com MX preference = ten, mail exchanger = mta.china.com
--This is the host name that the MX record for china.com points to

china.com nameserver = ns2.china.com
china.com nameserver = ns1.china.com
mta.china.com Internet address = 211.99.189.179
--This is the IP address of the host name to which the MX record of china.com is pointing

ns1.china.com Internet address = 61.151.243.136
ns2.china.com Internet address = 202.84.1.101zz

3) The specification's MX record should be resolved by the primary domain by a host name (mta.china.com in this case). Again this host name resolves one or more IP addresses (in this case, 211.99.189.179 and 211.99.189.180), and cannot directly resolve an IP address from the primary domain, and the primary domain resolves the The host name should not be the same as the primary domain name.

4 Enter "Set Q=ptr" return, enter PTR record query status

> 211.99.189.179―― This is the IP address of the mail server you are querying
server:ns-pd.online.sh.cn
address:202.96.209.133

Non-authoritative Answer:
179.189.99.211.in-addr.arpa name = mta.china.com-This is the host name that the PTR record for this IP address points to

189.99.211.in-addr.arpa nameserver = ns.intercom.com.cn
189.99.211.in-addr.arpa nameserver = ns1.intercom.com.cn
ns.intercom.com.cn Internet address = 211.99.207.229
ns1.intercom.com.cn Internet address = 211.152.53.3

5) Note: Domain Name resolution modification and add is only in the domain name provider's individual DNS modified, the other person's use of DNS server is not the same as the DNS server you apply for domain resolution, so when your domain name is added or modified, only the data synchronization between DNS servers to see the correct resolution results. Synchronization in the same region can take several hours, national DNS synchronization may take 2 days, global DNS synchronization may take 4 days or more, so domain name resolution changes cannot take effect immediately.