See: http://openrbl.org/ip/204/127/198/38.htm. Apparently that address is listed in some DNSRBLs. And, unfortunately, both ATTBI and Yahoo have had mail servers included in some DNSRBLs because of perhaps overaggressive widening of address spaces by RBL administrators.
You might try using relays.ordb.org or relays.osirusoft.com, and see if the
behavior changes.
--- Noel
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