Error codes
Here is a list, possibly incomplete and not necessarily current, of the error codes encountered when something goes wrong with sending or receiving messages.
| Error Code | Error Text | Description |
| 0x800CCC00 | LOAD_SICILY_FAILED | Authentication did not load |
| 0x800CCC01 | INVALID_CERT_CN | Invalid certificate content |
| 0x800CCC02 | INVALID_CERT_DATE | Invalid certificate date |
| 0x800CCC03 | ALREADY_CONNECTED | User already connected |
| 0x800CCC04 | CONN | Not available |
| 0x800CCC05 | NOT_CONNECTED | Not connected to server |
| 0x800CCC06 | CONN_SEND | Not available |
| 0x800CCC07 | WOULD_BLOCK | Not available |
| 0x800CCC08 | INVALID_STATE | Not available |
| 0x800CCC09 | CONN_RECV | Not available |
| 0x800CCC0A | INCOMPLETE | Message download incomplete |
| 0x800CCC0B | BUSY | Server or mail drop is busy |
| 0x800CCC0C | NOT_INIT | Not available |
| 0x800CCC0D | CANT_FIND_HOST | Cannot locate server |
| 0x800CCC0E | FAILED_TO_CONNECT | Cannot connect to server |
| 0x800CCC0F | CONNECTION_DROPPED | Connection closed |
| 0x800CCC10 | INVALID_ADDRESS | Address not known on server |
| 0x800CCC11 | INVALID_ADDRESS_LIST | Mailing list not known on server |
| 0x800CCC12 | SOCKET_READ_ERROR | Unable to send Winsock request |
| 0x800CCC13 | SOCKET_WRITE_ERROR | Unable to read Winsock reply |
| 0x800CCC14 | SOCKET_INIT_ERROR | Unable to initialize Winsock |
| 0x800CCC15 | SOCKET_CONNECT_ERROR | Unable to open Windows Socket |
| 0x800CCC16 | INVALID_ACCOUNT | User account not recognized |
| 0x800CCC17 | USER_CANCEL | User canceled operation |
| 0x800CCC18 | SICILY_LOGON_FAILED | Logon attempt failed |
| 0x800CCC19 | TIMEOUT | Not available |
| 0x800CCC1A | SECURE_CONNECT_FAILED | Unable to connect by using Secure Sockets Layer (SSL) |
| 0x800CCC40 | WINSOCK_WSASYSNOTREADY | Network subsystem is unusable |
| 0x800CCC41 | WINSOCK_WSAVERNOTSUPPORTED | Windows Sockets cannot support this application |
| 0x800CCC42 | WINSOCK_WSAEPROCLIM | Not available |
| 0x800CCC43 | WINSOCK_WSAEFAULT | Bad address |
| 0x800CCC44 | WINSOCK_FAILED_WSASTARTUP | Unable to load Windows Sockets |
| 0x800CCC45 | WINSOCK_WSAEINPROGRESS | Operation now in progress |
| 0x800CCC60 | SMTP_RESPONSE_ERROR | Invalid response |
| 0x800CCC61 | SMTP_UNKNOWN_RESPONSE_CODE | Unknown error code |
| 0x800CCC62 | SMTP_500_SYNTAX_ERROR | Syntax error returned |
| 0x800CCC63 | SMTP_501_PARAM_SYNTAX | Parameter syntax incorrect |
| 0x800CCC64 | SMTP_502_COMMAND_NOTIMPL | Command not implemented |
| 0x800CCC65 | SMTP_503_COMMAND_SEQ | Incorrect command sequence |
| 0x800CCC66 | SMTP_504_COMMAND_PARAM_NOTIMPL | Command not implemented |
| 0x800CCC67 | SMTP_421_NOT_AVAILABLE | Command not available |
| 0x800CCC68 | SMTP_450_MAILBOX_BUSY | Mailbox is locked and busy |
| 0x800CCC69 | SMTP_550_MAILBOX_NOT_FOUND | Mailbox not found |
| 0x800CCC6A | SMTP_451_ERROR_PROCESSING | Error processing request |
| 0x800CCC6B | SMTP_551_USER_NOT_LOCAL | User mailbox is known, but mailbox not on this server |
| 0x800CCC6C | SMTP_452_NO_SYSTEM_STORAGE | No space to store messages |
| 0x800CCC6D | SMTP_552_STORAGE_OVERFLOW | Storage limit exceeded |
| 0x800CCC6E | SMTP_553_MAILBOX_NAME_SYNTAX | Invalid mailbox name syntax |
| 0x800CCC6F | SMTP_554_TRANSACT_FAILED | Transaction failed |
| 0x800CCC78 | SMTP_REJECTED_SENDER | Unknown sender |
| 0x800CCC79 | SMTP_REJECTED_RECIPIENTS | Server rejected recipients |
| 0x800CCC7A | SMTP_NO_SENDER | No sender address specified |
| 0x800CCC7B | SMTP_NO_RECIPIENTS | No recipients specified |
| 0x800CCC31 | HTTP_BAD_REQUEST | Bad request configuration, or bad or malformed request |
| 0x800CCCA0 | NNTP_RESPONSE_ERROR | News server response error |
| 0x800CCCA1 | NNTP_NEWGROUPS_FAILED | Newsgroup access failed |
| 0x800CCCA2 | NNTP_LIST_FAILED | LIST command to server failed |
| 0x800CCCA3 | NNTP_LISTGROUP_FAILED | Unable to display list |
| 0x800CCCA4 | NNTP_GROUP_FAILED | Unable to open group |
| 0x800CCCA5 | NNTP_GROUP_NOTFOUND | Group not on server |
| 0x800CCCA6 | NNTP_ARTICLE_FAILED | Message not on server |
| 0x800CCCA7 | NNTP_HEAD_FAILED | Message header not found |
| 0x800CCCA8 | NNTP_BODY_FAILED | Message body not found |
| 0x800CCCA9 | NNTP_POST_FAILED | Unable to post to server |
| 0x800CCCAA | NNTP_NEXT_FAILED | Unable to open next message |
| 0x800CCCAB | NNTP_DATE_FAILED | Unable to display date |
| 0x800CCCAC | NNTP_HEADERS_FAILED | Unable to display headers |
| 0x800CCCAD | NNTP_XHDR_FAILED | Unable to display MIME headers |
| 0x800CCCAE | NNTP_INVALID_USERPASS | Invalid user or password |
| 0x800CCCD1 | IMAP_LOGINFAILURE | Logon failed |
| 0x800CCCD2 | IMAP_TAGGED_NO_RESPONSE | Message tagged |
| 0x800CCCD3 | IMAP_BAD_RESPONSE | Invalid response to request |
| 0x800CCCD4 | IMAP_SVR_SYNTAXERR | Syntax error |
| 0x800CCCD5 | IMAP_NOTIMAPSERVER | Not an IMAP server |
| 0x800CCCD6 | IMAP_BUFFER_OVERFLOW | Buffer limit exceeded |
| 0x800CCCD7 | IMAP_RECVR_ERROR | Recovery error |
| 0x800CCCD8 | IMAP_INCOMPLETE_LINE | Incomplete data |
| 0x800CCCD9 | IMAP_CONNECTION_REFUSED | Connection not allowed |
| 0x800CCCDA | IMAP_UNRECOGNIZED_RESP | Unknown response |
| 0x800CCCDB | IMAP_CHANGEDUID | User ID has changed |
| 0x800CCCDC | IMAP_UIDORDER | User ID command failed |
| 0x800CCCDD | IMAP_UNSOLICITED_BYE | Unexpected disconnect |
| 0x800CCCDE | IMAP_IMPROPER_SVRSTATE | Invalid server state |
| 0x800CCCDF | IMAP_AUTH_NOT_POSSIBLE | Unable to authorize client |
| 0x800CCCE0 | IMAP_OUT_OF_AUTH_METHODS | No more authorization types |
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