What are smtp error codes what does each mean?

Smtp Error Codes - How annoying can it be when your email program gives you a message could not send message followed by a non descript error message.

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..

Message has successfully completed task without errors

Mail server has accepted task but has taken no action

A confirmation message is required

Mail server has understood request but requires more information to complete it

Mails server has encountered temporary failure. If command is repeated without change it might be completed, try again

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

The third digit shows us the status of the problem itself, and together with the other two digits makes it possible to accurately pinpoint smtp errors

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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