On Fri, Mar 19, 2010 at 12:32:13PM -0400, Wietse Venema wrote: > > > And why would Yahoo be doing a CNAME lookup? > > > > Their MTA does that for all destinations, among other lookups. > > > > Your DNS server is a bit odd: > > > > $ dig +trace -t any slsware.com > > > > ;; connection timed out; no servers could be reached > > > > While asking for "cname" or "mx" works... Perhaps their code does a > > "T_ANY" lookup. > > If I recall correctly, Yahoo runs a modified qmail, and indeed: > > switch(resolve(sa,T_ANY))
So that's the issue then, the DNS server in question does not support T_ANY. Most likely it is behind a firewall that does not understand T_ANY, and drops the DNS packets for security reasons. Otherwise, the DNS server itself is deficient. -- Viktor. P.S. Morgan Stanley is looking for a New York City based, Senior Unix system/email administrator to architect and sustain our perimeter email environment. If you are interested, please drop me a note.