On Thu, May 04, 2023 at 01:02:14AM +0000, Ken Peng via Postfix-users wrote:
> I am just not sure, for this domain SpaceMail.com, who has a CNAME to > CDN for the root domain, every query to this domain will get a CNAME. > for instance, > > $ dig spacemail.com mx +nocmd +noall +answer > spacemail.com. 60 IN CNAME > spacemail.com.cdn.cloudflare.net. > > $ dig spacemail.com txt +nocmd +noall +answer > spacemail.com. 47 IN CNAME > spacemail.com.cdn.cloudflare.net. Yes, so called "zone apex cnames" are a common abuse of DNS requirements to meet customer demand until "SVCB" and "HTTPS" records eventually take over that rĂ´le. > How does it get mail then? incoming mail was handled by > spacemail.com.cdn.cloudflare.net? MX records are not required to receive email, just A and sometimes even just AAAA records are sufficient. -- Viktor. _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org