Dnia 10.06.2020 o godz. 00:29:04 Nathan Ward pisze:
> 
> Hi - thanks for your reply. I have explored that option, as noted later in
> my message - but I’d like to be able to accept email for user@gtld - where
> there is no dot in the domain, but there is still a domain.

"user@something-with-no-dot" won't be interpreted the way you suggest.

Original format of e-mail address is "user@hostname", not "user@domain". And
a hostname may have no domain part.

So if you put something without a dot to the right of ".", it will be
interpreted as hostname, and that hostname will be resolved according to
current resolver configuration in effect. Ie. the hostname will usually
either be searched in the local domain, whatever it is, or - if the resolver
configuration permits - the name will also be searched in /etc/hosts. If the
hostname is not found, the address will be treated as non-existent and the
message rejected.

Shortly said, "user@com" will mean user at a host named "com" in your local
domain - whatever it is - or another host you called "com" in your
/etc/hosts file, and not user at a MX for TLD domain .com (even if such a MX
exists).
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."

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