I think you didn't mean domain. In that case, the catchall address encourages
delivery. I'm looking for a guaranteed bounce, for test purposes, at any email
service provider.
I think we understand what you want. You can't have it.
Beyond the issue of catchall domains, there's the more basic issue that
the mapping of domains to service providers is outside the IETF's remit,
and pretty much impossible to define anyway when you consider all of the
ways that mail is routed and handled.
R's,
John
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