> 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.