AirLive ES-4000 v2 - Manual (Page 58)

5.3 MX (eXchanger)
It served as a mail agent for DNS server and a window to the outside for mail services. In spite of ailing for
mail server replacement, the mail server could be back to function in no time just by modifying the DNS
address.
Ex.1:
"MX", also known as "Mail eXchanger", is a type of resource record especially designed for mail service.
(Table 5-3)
Domain Name Type IP Address
host25.airlive.com A 211.22.22.24
mail.airlive.com MX host25.airlive.com
Table 5-3 Mapping table of mail eXchanger
Under DOS mode, type nslookup -type=MX mail.airlive.com , you will find that mail.airlive.com is mapping
to host25.airlive.com (the mail eXchanger) and its IP address 211. 22. 22. 24.
1. “nslookup” is the instruction of locating a DNS server.
2. “-type” defines the DNS type.
3. “mail.airlive.com” is the inquired DNS name.
For example, the customer service department of Test company wants to email to [email protected] , a
mail server (test.com.tw) served as a SMTP server decides where and how to send the mail by inquiring the
target DNS server.
The MX record of the inquiry of mail.airlive.com is as followed: (Table 5-4)
Domain Name Type IP Address
host3.airlive.com A 61.11.11.10
mail.airlive.com MX host3.airlive.com
Table 5-4 MX Record of the inquiry of mail.airlive.com
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