Hi, I have a sender who sends from a domain with a null MX set to localhost. Exim returns a 451 loca temporary failure because the dnslookup router defers the mail (lowest mx points at localhost). I would expect some form of 500-type error returning. When I send a mail to that domain it also gets defered and frozen. Again I would expect some error.
What setting do I have to make in the dnslookup-router that a “MX 0 localhost.” fails and not defers? Best Niels
smime.p7s
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