[dns-operations] Why would an MTA issue an ANY query instead of an MX query?

[sthaug at nethelp.no]

> > limiting EDNS responses to 1460 bytes, as suggested [by me], will
> > block quite a few legitimate replies (not just ANY replies).
> 
> Why? The response will be sent, just with a TC bit, and the client, if
> it is not lying about its IP address, will retry with TCP. No
> blocking.

Agreed, this should work fine. Muddled thinking on my part.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no