寄信時看到「550 Cannot resolve your IP to domain name」訊息?

當您寄信時看到「550 Cannot resolve your IP to domain name」的訊息,表示您的電腦 IP 位址未註冊完整 DNS 資料(IP address to domain name, domain name to IP address 兩者要一致),故本組寄信(SMTP)伺服器不接受來自此 IP 位址的寄信,請洽貴單位網管完成 DNS 註冊。

C:\Documents and Settings>nslookup 140.114.63.38
Server:  dns1c.oz.nthu.edu.tw
Address:  140.114.64.1

Name:    net.nthu.edu.tw
Address:  140.114.63.38


C:\Documents and Settings>nslookup net.nthu.edu.tw
Server:  dns1c.oz.nthu.edu.tw
Address:  140.114.64.1

Non-authoritative answer:
Name:    net.nthu.edu.tw
Address:  140.114.63.38