> On Sep 17, 2020, at 12:43 PM, natan maciej milaszewski <na...@mandzur.pl>
> wrote:
>
> In e-mail incoming I need a MX restrictions - allow only domain who have
> add MX in DNS - I known this is not RFC friendly ...
Just in case someone gets the wrong impression about MX records being
required...
It is more than "not RFC friendly", it is simply broken viz. the public
Internet. Many legitimate sending domains have no MX records, this is
normal. Refusing mail from non-MX domains does damage to the email
ecosystem.
It is difficult to imagine a situation where on the one hand you know
definitively that all the domains you'll be receiving email from have
MX records, and on the other hand you don't simply have a list of all
said domains, making the check for MX records moot.
--
Viktor.
