Port25.com is a renowned world leader on enterprise-grade email solutions. How can port25.com has this crazy setting in MX:
port25.com. 3600 IN MX 100 mail.port25.com.
mail.port25.com. 3600 IN AAAA 2002:453f:951e::1
This leads me to issue my last serious warning to all network administrators: 6to4 addresses should not be used to set up web and email servers, whether in test mode or production mode. They cause a lot of troubles. Please use 6in4 tunneling.
port25.com. 3600 IN MX 100 mail.port25.com.
mail.port25.com. 3600 IN AAAA 2002:453f:951e::1
This leads me to issue my last serious warning to all network administrators: 6to4 addresses should not be used to set up web and email servers, whether in test mode or production mode. They cause a lot of troubles. Please use 6in4 tunneling.
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