![]() ![]() Too many connections from origin (rate control). TLS not available due to temporary reason. Requested action aborted: local error in processing. Requested action not taken: mailbox unavailable. Service not available, closing transmission channel. 553 - The command was aborted because the mailbox name is invalid.ĭeferred due to suspect content, please try again later.552 - The action was aborted due to exceeded storage allocation.The server then gives a forwarding address to try. 551 - The recipient is not local to the server.550 - The requested command failed because the user's mailbox was unavailable (for example, because it was not found, or because the command was rejected for policy reasons).504 - A command parameter is not implemented.503 - The server has encountered a bad sequence of commands.501 - A syntax error was encountered in command arguments.500 - The server could not recognize the command due to a syntax error. ![]() 454 - TLS encoding is not available due to a temporary condition.452 - The command has been aborted because the server has insufficient system storage.Perhaps contact the the administrator to alert him/her of the issue. 451 - The command has been aborted due to a server error.450 - The requested command failed because the user's mailbox was unavailable (for example because it was locked).421 - The service is not available and the connection will be closed.420 - The message has been deferred due to suspect content.SMTP error codes you'll see in the Delivery Details field of the Message Details popup for a rejected or deferred message include the following, with more details listed in the table below: In the Delivery Status field you might see Rejected and a Delivery Detail with an SMTP error code.To view an SMTP error code for a rejected or deferred message in the Barracuda Email Security Gateway web interface: In this case the mail server may only provide an SMTP error code in the server's log, or in the text of the message returned to the sender. Depending on the actual problem it encounters, the destination mail server that did not accept the message may not be able to provide detailed help on how to resolve a problem. This is a basic guide to the SMTP return (or 'error') codes you may see for rejected or deferred messages in the Message Log of the Barracuda Email Security Gateway when an outbound message cannot be delivered to or accepted by the destination mail server. ![]()
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