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What does a 4xx or 5xx error message indicate?
Why am I getting “451 Message temporarily deferred” or "421 Message from x.x.x.x temporarily deferred" errors when sending mail to Yahoo!?
421 4.7.0 [TS01] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55
421 4.7.0 [TS02] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.56
421 Message from (x.x.x.x) temporarily deferred - 4.16.50
421 Message temporarily deferred - [numeric code]
451 VS* Excessive unknown recipients - possible Open Relay
451 Resources temporarily not available - Please try again later [#4.16.5]
451 Message temporarily deferred - [numeric code]
553 5.7.1 [BL21] Connections not accepted from IP addresses on Spamhaus PBL
553 5.7.1 [BL22] Connections not accepted from IP addresses on Spamhaus SBL
553 5.7.1 [BL23] Connections not accepted from IP addresses on Spamhaus XBL
553 Mail from x.x.x.x not allowed
554 5.7.1 [MW01] Message content not accepted for policy reasons
554 Message type not allowed. UP Email not accepted for policy reasons
554 Message not allowed: DK Email not accepted for policy reasons
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