[daijope ~]$ nslookup -q=mx aliyun.com
Server: 10.125.250.210
Address: 10.125.250.210#53
Non-authoritative answer:
aliyun.com mail exchanger = 10 mx2.mail.aliyun.com.
Authoritative answers can be found from:
aliyun.com nameserver = ns4.aliyun.com.
aliyun.com nameserver = ns5.aliyun.com.
aliyun.com nameserver = ns3.aliyun.com.
mx2.mail.aliyun.com internet address = 110.75.48.150
ns3.aliyun.com internet address = 115.124.17.155
ns4.aliyun.com internet address = 110.75.20.27
ns5.aliyun.com internet address = 110.75.38.28
[daijope ~]$ telnet 110.75.48.150 25
Trying 110.75.48.150...
Connected to 110.75.48.150.
Escape character is '^]'.
220 mx1.aliyun-inc.com MX AliMail Server(127.0.0.1)
HELO taobao.com\r\n
250 Ok
MAIL FROM:<check@suho.com>\r\n
250 Mail Ok
RCPT TO:<zhoulai@aliyun.com>\r\n
250 Rcpt Ok
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