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A comment on Please do not put IP addresses into DNS MX records. Parent comment

Re:Please do not put IP addresses into DNS MX records by vetinari on Sunday February 21, 2021 @02:22PM (#26216277)
That would require updating too much software in the field.

Meanwhile you can use ALIAS record and get the same result, without others noticing.

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Re:Please do not put IP addresses into DNS MX records by teddyh on Sunday February 21, 2021 @03:52PM (#26217069)
There is no such thing as an ALIAS record. That’s something your DNS provider made up and shows to you in the interface, but behind the scenes they are providing the same old AAAA and A records as always, along with some sort of auto-updating feature which they will run to detect changes in the address of the name in the “ALIAS record”. How often this will update is anyone’s guess as it’s up to the DNS provider.

See: https://en.wikipedia.org/wiki/CNAME_record#ANAME_record

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Re:Please do not put IP addresses into DNS MX records by fred256 on Sunday February 21, 2021 @03:51PM (#26217056)
Sorry to be pedantic, but there is no such thing as an ALIAS record. It's just the DNS server doing the indirection for you.
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