以下是消息的子类型 -
| CPIM | http | s-http |
| delivery-status | news | sip |
| disposition-notification | partial | sipfrag |
| external-body | rfc822 |
以下是消息的子类型 -
| CPIM | http | s-http |
| delivery-status | news | sip |
| disposition-notification | partial | sipfrag |
| external-body | rfc822 |
