Hi
this is completely off topic for this list (there is only a marginal
connection since Postfix is the MTA but it's not a Postfix question),
but maybe someone has knowledge on this.
I came across something that I have not seen before: a domain (call it
example.com) that has no email addresses. No one sends or receives email
for that domain.
The domain has some hosts, e.g. host1.example.com etc which have
webservers and postfix (null client configuration) used to send outgoing
email for a domain which is NOT example.com. That other domain can
receive email via its own incoming MX.
My first thought was to follow RFC7505 and define null mx records for my
example.com that has no email accounts, so no server will bother to try
and deliver email to it.
https://www.rfc-editor.org/rfc/rfc7505.html
My doubt is that since the outgoing email server identifies itself as
host1.example.com in the EHLO, is there a requirement or even an
expectation that postmas...@example.com will be able to receive email.
In that case I'd need to define an incoming email server only for that
purpose, since there are no other email addresses in my example.com
John
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