On Fri, Mar 19, 2010 at 06:08:12AM -0600, Glenn English wrote:
> It looks to me like the problem has something to do with DNS, not
> SMTP, right?
Yes.
> And why would Yahoo be doing a CNAME lookup?
Their MTA does that for all destinations, among other lookups.
> (I checked
> from a remote site -- my domain's MX server's IP is an A, and I don't
> see anything having to do with CNAMEs in 'host -t MX slsware.com'.)
Your DNS server is a bit odd:
$ dig +trace -t any slsware.com
...
slsware.com. 172800 IN NS ns1.richeyrentals.com.
slsware.com. 172800 IN NS ns1.slsware.com.
slsware.com. 172800 IN NS server.slsware.com.
;; Received 148 bytes from 192.5.6.30#53(A.GTLD-SERVERS.NET) in 46 ms
;; connection timed out; no servers could be reached
While asking for "cname" or "mx" works... Perhaps their code does a
"T_ANY" lookup.
--
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.
