6to4 address connectivity problem

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.

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