SMTP Response Code 220:
This code indicates the SMTP server is ready for the mail transfer operation.
Response code 221:
The connection to the mail server is ending. This happens only after the completion of the entire process. The end result can be a success or failure.
Response code 250:
The requested action is processed and completed successfully. This code is the usual response for all the requested actions.
Response code 354:
If the SMTP server is ready to accept the message itself, then this error code will be displayed on the screen.
Response code 451:
If the requested command is aborted by a server error, due to receiving mail server's rules, then there is a chance for this code to be displayed on the screen.
Response code 452:
This code is returned when the requested command is aborted by the server due to insufficient system storage. To resolve this issue, review your mail messages and queue them to resent the mails.
To know more about the SMTP Response Codes, click the Call or Call Us button available on this web page.
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