DNS reply ADDITIONAL SECTION data with MX lookup ?

[Peter Koch]

quoting Brad Knowles:

> 	Just make sure that you've gotten authoritative answers, because 
> if you get an answer out of cache, some RRs may have been aged out at 
> a different time, so you could get incomplete information.

as of RFC2181 the TTLs of RRs in an RRSet have to be equal and BIND has been
enforcing this for quite some time now. Then, there's other software ...

-Peter