Dnia 28.04.2023 o godz. 15:59:53 Gerd Hoerst via Postfix-users pisze:
> 
> question 1st : is it a good idea to reject any email which is not
> sent from a domain  (means sen...@domain.tld) any other like
> sen...@sub.domain.tld or sub.sub.domain.tld is rejected ?

As others have said, it's a total misunderstanding.

Mail coming from subdomains is a perfectly normal thing.

For example, many big corporations and/or universities do not have a single
top-level mail service for the whole entity, but they have separate mail
servers at department levels. It's totally normal that you will see emails
from u...@department.company.com.

Also take into account that many countries use two-level domain registration
scheme - for example someone already mentioned UK, where you have *.co.uk
for companies or *.ac.uk for universities. Also my country uses for example
*.com.pl, *.edu.pl (not mentioning *.gov.pl !) addressing scheme - to be
more confusing ;), in parallel to direct registrations in *.pl, and to
geographical per-city scheme like *.krakow.pl, *.waw.pl, *.gda.pl etc.

And please look at my email address as well :)
-- 
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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