Re: [mailop] proper NULL MX behaviour for MTAs?

Franck Martin via mailop wrote: > > This could be true but then RFC7505 is recent, so I'm not sure that proper > MTAs are yet properly behaving. I wonder what sendmail, postfix, exim > really do? Exim has treated null MXs as invalid since 2004.

Re: [mailop] proper NULL MX behaviour for MTAs?

Suresh Ramasubramanian wrote: > A domain with a null mx may well originate email If they try to do that they will be sad. A lot of MTAs will reject email with a MAIL FROM using a domain that is invalid according to the DNS, and a null MX counts as invalid for this purpose.

Re: [mailop] proper NULL MX behaviour for MTAs?

In article you write: >Suresh Ramasubramanian wrote: > >> A domain with a null mx may well originate email >If they try to do that they will be sad. RFC 7505 section 4.2 agrees with you. Section 4.1 suggests