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MailTrace - List of Errors


Return Code Description
250 The mail server has successfully delivered the message!
420 Timeout communication problem encountered during transmission. 
421 Service not available, closing control connection. This may be a reply to any command if the service knows it must shut down. 

Requested action not taken – The mailbox was unavailable at the remote end.

A secondary SMTP error code may follow “450” to refine the reason for the failure to transmit the message, e.g. “SMTP error 450".


Requested action aborted – Local error in processing.


Requested action delayed – Local problem


<IP_Address> has recently sent spam.

452 Requested action not taken – Insufficient storage.
471 This is a local error with the sending server and is often followed with "Please try again later."
550 Requested action not taken. File unavailable (e.g., file not found, no access). It usually defines a non-existent email address on the remote side.
554 SMTP 5.7.1 is basically a rejection from the Recipient Domain.
  The address in MAIL FROM appears to have insufficient submission rights, or is invalid, or is not authorized with the authentication used; the address in a RCPT TO command is inconsistent with the permissions given to the user; the message data is rejected based on the submitting user.

Possible scenarios:

  1. IP has been included in a Real-Time Blacklist due to Spam coming from your Domain.
  2. Your Domain/IP has been blacklisted by the recipient.
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