sm drresistornet 0854 25022008 tony bunce wrote anyone else issues sending mail yahoo returning 421 message temporarily deferred every message servers try send server retries like yahoo never accepts message even day retrying google turned several people issue one solution dsn right spf records sign outgoing messages using domainkeys deferring connections mail servers due spam complaints regards sm thu 07 aug 2008 163525 0800 ot yahoo deferred