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Explanations of mail system status codes - or mail error codes.

In the following you may find a short description and "error type" of some of the mail system status/error codes.

Send/Receive error codes

General Errors
Error Code	Description	Error Type
0×800CCC00	Authentication did not load	LOAD_SICILY_FAILED
0×800CCC01	Invalid certificate content	INVALID_CERT_CN
0×800CCC02	Invalid certificate date.	INVALID_CERT_DATE
0×800CCC03	User already connected.	ALREADY_CONNECTED
0×800CCC04	-	CONN
0×800CCC05	Not connected to server.	NOT_CONNECTED
0×800CCC06	-	CONN_SEND
0×800CCC07	-	WOULD_BLOCK
0×800CCC08	-	INVALID_STATE
0×800CCC09	-	CONN_RECV
0×800CCC0A	Message download incomplete	INCOMPLETE
0×800CCC0B	Server or maildrop is busy.	BUSY
0×800CCC0C	-	NOT_INIT
0×800CCC0D	Cannot locate server.	CANT_FIND_HOST
0×800CCC0E	Cannot connect to server.	FAILED_TO_CONNECT
0×800CCC0F	Connection closed.	CONNECTION_DROPPED
0×800CCC10	Address not known on server.	INVALID_ADDRESS
0×800CCC11	Mailing list not known on server	INVALID_ADDRESS_LIST
0×800CCC12	Unable to send Winsock request.	SOCKET_READ_ERROR
0×800CCC13	Unable to read Winsock reply	SOCKET_WRITE_ERROR
0×800CCC14	Unable to initialize Winsock.	SOCKET_INIT_ERROR
0×800CCC15	Unable to open Windows Socket	SOCKET_CONNECT_ERROR
0×800CCC16	User account not recognized.	INVALID_ACCOUNT
0×800CCC17	User canceled operation	USER_CANCEL
0×800CCC18	Logon attempt failed.	SICILY_LOGON_FAILED
0×800CCC19	A time-out occurred while communicating with the server	TIMEOUT
0×800CCC1A	Unable to connect using SSL.	SECURE_CONNECT_FAILED

Winsock Errors
Error Code	Description	Error Type
0×800CCC40	Network subsystem is unusable.	WINSOCK_WSASYSNOTREADY
0×800CCC41	Windows Sockets cannot support this application.	WINSOCK_WSAVERNOTSUPPORTED
0×800CCC42	-	WINSOCK_WSAEPROCLIM
0×800CCC43	Bad address.	WINSOCK_WSAEFAULT
0×800CCC44	Unable to load Windows Sockets.	WINSOCK_FAILED_WSASTARTUP
0×800CCC45	Operation now in progress. This error appears if a Windows Sockets API is called while a blocking function is in progress.	WINSOCK_WSAEINPROGRESS

SMTP Errors
Error Code	Description	Error Type
0×800CCC60	Invalid response.	SMTP_RESPONSE_ERROR
0×800CCC61	Unknown error code.	SMTP_UNKNOWN_RESPONSE_CODE
0×800CCC62	Syntax error returned.	SMTP_500_SYNTAX_ERROR
0×800CCC63	Parameter syntax incorrect.	SMTP_501_PARAM_SYNTAX
0×800CCC64	Command not implemented.	SMTP_502_COMMAND_NOTIMPL
0×800CCC65	Improper command sequence.	SMTP_503_COMMAND_SEQ
0×800CCC66	Command not implemented.	MTP_504_COMMAND_PARAM_NOTIMPL
0×800CCC67	Command not available.	SMTP_421_NOT_AVAILABLE
0×800CCC68	Mailbox is locked and busy.	SMTP_450_MAILBOX_BUSY
0×800CCC69	Mailbox not found.	SMTP_550_MAILBOX_NOT_FOUND
0×800CCC6A	Error processing request.	SMTP_451_ERROR_PROCESSING
0×800CCC6B	User mailbox is known but mailbox not on this server.	SMTP_551_USER_NOT_LOCAL
0×800CCC6C	No space to store messages.	SMTP_452_NO_SYSTEM_STORAGE
0×800CCC6D	Storage limit exceeded.	SMTP_552_STORAGE_OVERFLOW
0×800CCC6E	Invalid mailbox name syntax.	SMTP_553_MAILBOX_NAME_SYNTAX
0×800CCC6F	Transaction failed.	SMTP_554_TRANSACT_FAILED
0×800CCC78	Unknown sender. This is caused by having the incorrect e-mail address in the Reply-To field.	SMTP_REJECTED_SENDER
0×800CCC79	Server rejected recipients.	SMTP_REJECTED_RECIPIENTS
0×800CCC7A	No sender address specified.	SMTP_NO_SENDER
0×800CCC7B	No recipients specified.	SMTP_NO_RECIPIENTS

POP3 Errors
Error Code	Description	Error Type
0×800420CB	Mail cannot be stored on server.	POP3_NO_STORE
0×800CCC90	Client response invalid.	POP3_RESPONSE_ERROR
0×800CCC91	Invalid user name or user not found.	POP3_INVALID_USER_NAME
0×800CCC92	Password not valid for account.	POP3_INVALID_PASSWORD
0×800CCC93	Unable to interpret response.	POP3_PARSE_FAILURE
0×800CCC94	STAT Command required.	POP3_NEED_STAT
0×800CCC95	No messages on server.	POP3_NO_MESSAGES
0×800CCC96	No messages marked for retrieval.	POP3_NO_MARKED_MESSAGES
0×800CCC97	Message ID out of range.	POP3_POPID_OUT_OF_RANGE

IMAP Errors
Error Code	Description	Error Type
0×800CCCD1	Login failed.	IMAP_LOGINFAILURE
0×800CCCD2	Message tagged.	IMAP_TAGGED_NO_RESPONSE
0×800CCCD3	Invalid response to request.	IMAP_BAD_RESPONSE
0×800CCCD4	Syntax error.	IMAP_SVR_SYNTAXERR
0×800CCCD5	Not an IMAP server.	IMAP_NOTIMAPSERVER
0×800CCCD6	Buffer limit exceeded.	IMAP_BUFFER_OVERFLOW
0×800CCCD7	Recovery error.	IMAP_RECVR_ERROR
0×800CCCD8	Incomplete data.	IMAP_INCOMPLETE_LINE
0×800CCCD9	Connection not allowed.	IMAP_CONNECTION_REFUSED
0×800CCCDA	Unknown response.	IMAP_UNRECOGNIZED_RESP
0×800CCCDB	User ID has changed.	IMAP_CHANGEDUID
0×800CCCDC	User ID command failed.	IMAP_UIDORDER
0×800CCCDD	Unexpected disconnect.	IMAP_UNSOLICITED_BYE
0×800CCCDE	Invalid server state.	IMAP_IMPROPER_SVRSTATE
0×800CCCDF	Unable to authorize client.	IMAP_AUTH_NOT_POSSIBLE
0×800CCCE0	No more authorization types.	IMAP_OUT_OF_AUTH_METHODS

NNTP (News Server) Errors
Error Code	Description	Error Type
0×800CCCA0	News server response error.	NNTP_RESPONSE_ERROR
0×800CCCA1	Newsgroup access failed.	NNTP_NEWGROUPS_FAILED
0×800CCCA2	LIST command to server failed.	NNTP_LIST_FAILED
0×800CCCA3	Unable to display list.	NNTP_LISTGROUP_FAILED
0×800CCCA4	Unable to open group.	NNTP_GROUP_FAILED
0×800CCCA5	Group not on server.	NNTP_GROUP_NOTFOUND
0×800CCCA6	Message not on server.	NNTP_ARTICLE_FAILED
0×800CCCA7	Message header not found.	NNTP_HEAD_FAILED
0×800CCCA8	Message body not found.	NNTP_BODY_FAILED
0×800CCCA9	Unable to post to server.	NNTP_POST_FAILED
0×800CCCAA	Unable to post to server.	NNTP_NEXT_FAILED
0×800CCCAB	Unable to display date.	NNTP_DATE_FAILED
0×800CCCAC	Unable to display headers.	NNTP_HEADERS_FAILED
0×800CCCAD	Unable to display MIME headers.	NNTP_XHDR_FAILED
0×800CCCAE	Invalid user or password.	NNTP_INVALID_USERPASS

RAS (Remote Access) Errors
Error Code	Description	Error Type
0×800CCCC2	RAS/DUN not installed.	RAS_NOT_INSTALLED
0×800CCCC3	RAS/DUN process not found.	RAS_PROCS_NOT_FOUND
0×800CCCC4	RAS/DUN error returned.	RAS_ERROR
0×800CCCC5	Connectoid damaged or missing.	RAS_INVALID_CONNECTOID
0×800CCCC6	Error getting dial settings.	RAS_GET_DIAL_PARAMS

Enhanced Mail System Status Codes

Beside from getting the reported errors, there usually also is another error code listed. These error codes consist of 3 digits which could be separated by a dot ex. 213 or 2.1.3

These errors could also be sent to you in an email with a Delivery Status Notification code in it.

The first number will tell you the general status of the message;

2 - Success. The message has been delivered.
4 - Persistent Transient Failure. This means that the message was valid and accepted by the server but there is a temporary problem which prevents it from being delivered. The mail server will usually try to send it again later until a time out is reached. Until you get the a message that the server is giving up (see "5" below), there is no direct need to resend the message.
5 - Permanent. This is a fatal error and the message sent cannot be delivered. It's unlikely that the message can be delivered by a simple resend. A change must be made either within the message (wrong address, too big, too many recipients, etc), within the account settings or at the mail server of the sender or receiver.

The second 2 numbers will give you more details about why the message is delayed or failed;

X.0.0 Other undefined Status

X.1.0 Other address status
X.1.1 Bad destination mailbox address
X.2.0 Bad destination system address
X.1.3 Bad destination mailbox address syntax
X.1.4 Destination mailbox address ambiguous
X.1.5 Destination mailbox address valid
X.1.6 Mailbox has moved
X.1.7 Bad sender's mailbox address syntax
X.1.8 Bad sender's system address
X.1.9 Message relayed to non-compliant mailer

X.2.0 Other or undefined mailbox status
X.2.1 Mailbox disabled, not accepting messages
X.2.2 Mailbox full
X.2.3 Message length exceeds administrative limit.
X.2.4 Mailing list expansion problem

X.3.0 Other or undefined mail system status
X.3.1 Mail system full
X.3.2 System not accepting network messages
X.3.3 System not capable of selected features
X.3.4 Message too big for system
X.3.5 System incorrectly configured

X.4.0 Other or undefined network or routing status
X.4.1 No answer from host
X.4.2 Bad connection
X.4.3 Routing server failure
X.4.4 Unable to route
X.4.5 Network congestion
X.4.6 Routing loop detected
X.4.7 Delivery time expired

X.5.0 Other or undefined protocol status
X.5.1 Invalid command
X.5.2 Syntax error
X.5.3 Too many recipients
X.5.4 Invalid command arguments
X.5.5 Wrong protocol version
X.5.6 Authentication Exchange line is too long

X.6.0 Other or undefined media error/bad content
X.6.1 Media not supported
X.6.2 Conversion required and prohibited/bad domain or alias
X.6.3 Conversion required but not supported
X.6.4 Conversion with loss performed
X.6.5 Conversion failed
X.6.6 Message content not available

X.7.0 Other or undefined security status/authentication failure/violating site policy
X.7.1 Delivery not authorized, message refused
X.7.2 Mailing list expansion prohibited
X.7.3 Security conversion required but not possible
X.7.4 Security features not supported
X.7.5 Cryptographic failure
X.7.6 Cryptographic algorithm not supported
X.7.7 Message integrity failure
X.7.8 Trust relationship required/Authentication credentials invalid
X.7.9 Authentication mechanism is too weak
X.7.10 Encryption Needed
X.7.11 Encryption required for requested authentication mechanism
X.7.12 A password transition is needed
X.7.13 User Account Disabled
X.7.14 Trust relationship required
X.7.15 Authentication credentials invalid
X.7.16 Future release per-user message quota exceeded
X.7.17 Future release system message quota exceeded

Common combinations are;

421 or 4.2.1	Service not available, the connection will be closed (the server could be about to be restarted)
450 or 4.5.0	Requested action failed: mailbox unavailable (for instance, the mailbox is busy or locked)
451 or 4.5.1	Requested action aborted due to an error on the server (contact your ISP)
452 or 4.5.2	Requested action not taken due to insufficient system storage on the server (contact your ISP)
453 or 4.5.3	Requested action not taken due to policy settings (for instance, too many recipients specified)
500 or 5.0.0	Syntax error, command unrecognized (This may include errors such as command line too long)
501 or 5.0.1	Syntax error in parameters or arguments
502 or 5.0.2	Command not implemented
503 or 5.0.3	Bad sequence of commands
504 or 5.0.4	Command parameter not implemented (for instance, Helo command rejected: need fully-qualified hostname)
550 or 5.5.0	Requested action not taken: mailbox unavailable (for instance, mailbox not found, no access due to policy reasons)
551 or 5.5.1	User not local and an issue occurred when the server tried to forward the message.
552 or 5.5.2	Requested mail action aborted: exceeded storage allocation
553 or 5.5.3	Requested action not taken: mailbox name not allowed for instance, the mailbox name is invalid)
554 or 5.5.4	Transaction failed

More details about the individual error codes can be found within the base RFC document and its listed updates at the top.

Other error codes

Aside from the above listed error codes, there are many more error codes which you could encounter during send/receive. These usually refer to internal errors from MS Outlook ect., or are specific to a certain mail server or are actually coming from your virus scanner or another add-in that integrates with your send/receive or networking process.

Due to the nature and origins of these error codes, the list above will always be incomplete.

Error Code	Description	Cause/Possible solution
0×0004b9
0×000501
0×80000003
0×80004001	Not implemented
0×80004005	The operation failed	Virus scanner integration issue usually related to script blocking.
0×800300FD	Unknown Error	Indicates that there is insufficient space in the Temp folder -Empty your Deleted Items folder -Empty your Temp folder; C:\Windows\Temp
0×80040109	The Operation cannot be performed because the message has been changed	Virus scanner integration issue. Some add-in may have altered the message upon sending.
0×8004010F	Microsoft Exchange offline address book. Not downloading Offline address book files. A server (URL) could not be located.	Verify the publication address for the Offline Address Book (OAB) in Exchange.
0×80040115	The connection to the Microsoft Exchange server is unavailable. Outlook must be online or connected to complete this action.	The server is not reachable, check your connection and verify that Outlook is in on-line mode. This issue could also occur with other mail servers, not just Exchange.
0×80040119	An unknown error has occurred. Messaging interface has caused an unknown error.	Virus scanner integration issue usually related to authentication. This issue could also occur when there are errors in your pst-file.
0×8004011D	Task “Microsoft Exchange Server” reported error (0×8004011D): “The server is not available. Contact your administrator if this condition persists.”	The server is not reachable, check your connection and verify that Outlook is in on-line mode. This issue could also occur with other mail servers, not just Exchange.
0×80040126	The operation cannot be performed because the connection to the server is offline.	This issue is an Outlook Connector issue. If there is no general issues with Hotmail itself, make sure you have the latest version installed. Removing and re-adding your Hotmail account might help.
0×80040305	Your server administrator has limited the number of items you can open simultaneously. Email too big (Google Apps Sync)	These limitations can be set on the mail server. Contact your mail admin to find out which limitations are in affect.
0×80040600	An unknown error has occurred.	Virus scanner integration issue usually related to authentication. This issue could also occur when there are errors in your pst-file.
0×80040607	An unknown error occurred	Virus scanner integration issue. Authentication not enabled for the configured SMTP server.
0×8004060C	Unknown Error
0×80040900
0×80040FB3	Error encountered. Check documentation.	This issue is related to BlackBerry accounts. It appears that your account is not associated with a BES or Exchange account. Other causes could be a corrupted item that is trying to be synched. Remove this item and try again.
0×80042108	Outlook is unable to connect to your incoming (POP) e-mail server. If you continue to receive this message, contact your server administrator or ISP.
0×80042109	Outlook cannot connect to your outgoing (SMTP) e-mail server. If you continue to receive this message, contact your server administrator or ISP.
0×8004210A	The operation timed out waiting for a response from the receiving (POP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).	Virus scanner integration issue
0×8004210B	The operation timed out waiting for a response from the sending (SMTP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).	An address in the distribution list might be malformed or corrupted. Update/remove the address or recreate the distribution list.
0×80042112
0×8004218
0×80048002	This task was cancelled before it was completed.	Virus scanner integration issue. Some add-in may have altered the message upon sending.
0×8004DF0B
0×80070005	You don't have appropriate permissions to perform this operation	Refers to issues with the delivery location; -scan it for errors with scanpst.exe or scanost.exe -verify that you have read/write permissions on the pst-/ost-file -verify that the path to the pst-/ost-file is valid -verify that the ost-file belongs to the correct user and mailbox
0×8007000E
0×80070021
0×80070057	Could not complete operation. One or more parameter values are not valid. Sending reported error parameters not correct.	Virus scanner integration issue. This error could also occur with Google Apps Sync trying to sync your RSS folders to the server.
0×80072F17	Synchronization could not be completed. Try again later.	This issue is usually caused by issues with the SSL certificate.
0×8007007E	Unknown error
0×80090FB3
0×800C0131	Unknown error has occurred.	data storage issue
0×800C0133		data storage issue virus scanner integration issue
0×800C013B
0×800CCC33	Task 'Hotmail: Folder:Inbox Synchronizing headers.' reported error (0×800CCC33) : 'Access to the account was denied. Verify that your username and password are correct. The server responded 'Forbidden'.	This error is encountered when you are trying to make a connection to a Live Hotmail account without the Outlook Connector installed.
0×800CCC7D	Unknown Error	The outgoing SMTP server does not support secure connections. Verify your account settings or contact your ISP.
0×800CCC80	None of the authentication methods supported by this client are supported by your server.
0×800CCCF7
0×81FC0005		Close and reopen Outlook
0×834005
0xC0000005
0xD4904005

Mail Staus Codes and Explanation

Enhanced Mail System Status Codes