>># host mail.example.com >>mail.example.com is an alias for hostname.example.com. >>hostname.example.com has address 1.2.3.4 > > >Wrong. The MX record has to point to an A name, not a CNAME.
what? MX record's data field is a domain name That domain name owns one or more A records. With mail, the shortest resolution path is always best practice, and resolving through a CNAME is not the shortest. Similarly, an MX's IP should have only one PTR record, whose domain name in the data field "matches" with an A record: d.c.b.a.in-addr.arpa. PTR label.domain.tld. label.domain.tld. A a.b.c.d Len ______________________________________________ IMGate OpenSource Mail Firewall www.IMGate.net
