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Preferred method of advertizing a dual-stack mx server

>I currently have my mail server set to accept mail from either an IPv4
>address or an IPv6 one (a 2002::/16 address at the moment). and added an
>AAAA record to the host that is the MX record. Now, with that change, I've
>had a report of at least two users who couldn't mail us (nobody at their
>domains could).

	just to make sure:
	are the "two users" dual-stacked, or IPv4 only?  if dual-stacked,
	is IPv6 connectivity between you and "two users" okay?