| Type/Domain | Code | Description |
|---|
| JMAIL | 01 | the connection to host cannot be established |
| JMAIL | 02 | a to-be-sent-attachment has no content |
| JMAIL | 03 | a binary to-be-sent-attachment has no filename |
| JMAIL | 04 | at least one recipient or the sender has an invalid address |
| JMAIL | 05 | the connected host does not provide the requested protocol |
| JMAIL | 06 | general uncaught exception while sending |
| JMAIL | 07 | a generically defined operation is not implemented for a specific protocol (e.g. sendMessage() via IMAP) |
| JMAIL | 08 | connection specifies an unknown/unsupported protocol |
| JMAIL | 09 | a specific folder cannot be found or is not supported |
| JMAIL | 10 | a requested attribute of messages is not supported (raised for exchange only) |
| JMAIL | 11 | message cannot be retrieved (raised for exchange only) |
| JMAIL | 12 | native message cannot be concerted to Mail class |
| JMAIL | 13 | raw message content is not available |
| JMAIL | 14 | general uncaught exception while retrieving |
| JMAIL | 15 | messaging exception while retrieving attached nested messages |
| JMAIL | 16 | general uncaught exception while deleting |
| JMAIL | 17 | a message cannot be found by its ID |
| JMAIL | 18 | general uncaught exception while moving |
| JMAIL | 19 | signature of signed content could not be verified |
| JMAIL | 20 | the specified keystore could not be loaded |
| JMAIL | 21 | PGP public key ring cannot be loaded |
| JMAIL | 30 | cryptographic operation failed due to IO exception, usually a provided key is not in PEM format |
| JMAIL | 31 | cryptographic pgp related exception |
| JMAIL | 32 | IPgpKeyProvider not registered or returned NULL, i.e. key could not be retrieved |