SMTP Error Codes What Do They mean?

All SMTP errors follow a certain structure which can make understanding error codes much easier once understood.

The structure of error codes consists of three numbers.

Our first number tells us if the server accepted our request.



And there are 5 possible notifications..

a) Message has successfully completed task without errors.
b) Mail server has accepted task but has taken no action.
c) A confirmation message is required.
d) Mail server has understood request but requires more information to complete it.
e) Mail server has encountered temporary failure. If command is repeated without
f) change it. might be completed, try again.
g) Mail server has encountered fatal error, your request cannot be processed.

The second number gives us 4 possible usable notifications..

Syntax error Information, the status of the connection, the status of the mail server

211 system status code
214 help message
220 service ready
221 service closing transmission channel
250 requested mail action okay, completed
251 user not local, but will forward to
354 start mail input, end with
421 service not available, closing transmission channel
450 requested mail action not taken: mailbox unavailable
451 requested action aborted, local error in processing
452 requested action not taken, low system disk storage
500 syntax error or unrecognized command
501 syntax error in command line
502 command not implemented, due to above
503 bad sequence of commands
504 command parameter not implemented
550 requested action not taken: mailbox unavailable
551 user not local, try again
552 requested mail action aborted, exceeded mailbox storage allowance
553 requested action not taken, invalid mailbox name
554 Transaction failed

Many SMTP error codes are usually very simple fixes, so before you begin to look into why your getting a particular error make sure you have checked the basics it can save a lot of time.

Do you have a Working Internet Connection, Double check Login credentials, Correct Server configuration, Does your ISP have mail server problems, Are you downloading a very big email using a slow connection, be prepared to wait, Is your Winsock File Corrupt

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