No I do not believe an extra step was added. Take the following example for instance.
STMP server smtp.xyz.com. needs to send a message to some...@xyz.com. An MX lookup is performed for domain xyz.com. and the domain name of mx.xyz.com is returned. This is the first sentence:
"When a domain name associated with an MX RR is looked up and the associated data field obtained, the data field of that response MUST contain a domain name."
Now an A lookup is performed for that domain name of mx.xyz.com. and returned are the name srv1.xyz.com with it's address of 1.2.3.4, and the alias name of mx.xyz.com is also included in the result. This is the second sentence:
"That domain name, when queried, MUST return at least one address record (e.g., A or AAAA RR) that gives the IP address of the SMTP server to which the message should be directed."
@ 1800 IN A 1.2.3.4 srv1 1800 IN A 1.2.3.4 mx 1800 IN CNAME blah.xyz.com. @ 1800 IN MX 1 mx.xyz.com. Requirements met. _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
