The most likely issue would be that the TXT records don't fit in a 512 byte
response packet which is a problem for some cruddy middleboxes.
that was exactly the reason I started using 4k keys. I wanted to make sure
at least my infrastructure could handle DNS over TCP everywhere.
That's nice, but I don't see what that has to do with interoperating with
the rest of the world whose DNS does what it does.
Do you think, the DKIM specification should be more detailed on this pros and
cons?
No, the advice to use 2K keys will be reasonable for the forseeable
future even for very infrequent rotation.
R's,
John
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