Code451 Bounce typeSoft bounce RetryableYes Action neededWait 60s, retryTypical error message 451 Greylisted, please try again in 60 seconds ...
Code450 4.2.0 Bounce typeSoft bounce RetryableYes Action neededWait and retryTypical error message 450 4.2.0 Recipient address rejected: ...
Code450 4.7.1 Bounce typeSoft bounce RetryableYes (after fix) Action neededFix reverse DNSTypical error message 450 4.7.1 Client host ...
Code421 Bounce typeSoft bounce RetryableYes Action neededRetry laterTypical error message 421 Service Temporarily UnavailableWhat does ...
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