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Re: current usage of AAAA implicit MX?

2008-04-04 10:12:19

Thanks for the tweak to the nose Dave. ;-)

By "AAAA implicit MX", I mean: What happens if there is no MX record? Does SMTP we fall back to 1) looking for A records, or 2) looking for both A and AAAA records?

These questions are intended to find out what current IPv6 deployments do in these situations. When an MX is not found, are they already looking for both A and AAAA records, or are they only looking for A records. Are they following RFC 3974 or not? What's the installed base already doing?


Dave Crocker wrote:

Tony Hansen wrote:
Before we can put the issue of AAAA implicit MX to bed, we need to get an answer to the question of how much AAAA implicit MX is already being used in the real world.

1. I apologize both for poor memory and for being so thoroughly dense, but I don't know what "implicit MX" means and would appreciate a simple definition that folks agree on.

2. Per the comments of more than one of us, isn't the question of dropping MX for AAAA out of scope for this rfc2821bis effort?