MailChimp – Omnivore Warning

Zero Bounce Service

From the results, I was able to import

  • valid


  • CodeDescription
  • 5.0.0Address does not exist
  • 5.1.0Other address status
  • 5.1.1Bad destination mailbox address
  • 5.1.2Bad destination system address
  • 5.1.3Bad destination mailbox address syntax
  • 5.1.4Destination mailbox address ambiguous
  • 5.1.5Destination mailbox address valid
  • 5.1.6Mailbox has moved
  • 5.1.7Bad sender’s mailbox address syntax
  • 5.1.8Bad sender’s system address
  • 5.2.0Other or undefined mailbox status
  • 5.2.1Mailbox disabled, not accepting messages
  • 5.2.2Mailbox full
  • 5.2.3Message length exceeds administrative limit.
  • 5.2.4Mailing list expansion problem
  • 5.3.0Other or undefined mail system status
  • 5.3.1Mail system full
  • 5.3.2System not accepting network messages
  • 5.3.3System not capable of selected features
  • 5.3.4Message too big for system
  • 5.4.0Other or undefined network or routing status
  • 5.4.1No answer from host – the address is invalid
  • 5.4.2Bad connection
  • 5.4.3Routing server failure
  • 5.4.4Unable to route
  • 5.4.5Network congestion
  • 5.4.6Routing loop detected
  • 5.4.7Delivery time expired
  • 5.5.0Other or undefined protocol status
  • 5.5.1Invalid command
  • 5.5.2Syntax error
  • 5.5.3Too many recipients
  • 5.5.4Invalid command arguments
  • 5.5.5Wrong protocol version
  • 5.6.0Other or undefined media error
  • 5.6.1Media not supported
  • 5.6.2Conversion required and prohibited
  • 5.6.3Conversion required but not supported
  • 5.6.4Conversion with loss performed
  • 5.6.5Conversion failed
  • 5.7.0Other or undefined security status
  • 5.7.1Delivery not authorized, message refused
  • 5.7.2Mailing list expansion prohibited
  • 5.7.3Security conversion required but not possible
  • 5.7.4Security features not supported
  • 5.7.5Cryptographic failure
  • 5.7.6Cryptographic algorithm not supported
  • 5.7.7Message integrity failure


  • CodeDescription
  • 421service not available, closing transmission channel
  • 450Requested mail action not taken: mailbox unavailable (e.g., mailbox busy)
  • 451Requested action aborted: error in processing
  • 452Requested action not taken: insufficient system storage

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