邮箱A设置同时转发邮箱B，C发送邮件给A。
邮箱A日志
| Source | EventId |
| STOREDRIVER | RECEIVE |
| ROUTING | REDIRECT |
| ROUTING | REDIRECT |
| ROUTING | TRANSFER |
| STOREDRIVER | DELIVER |
邮箱B日志，注意日志Sender为C地址。
| Sender | Source | EventId |
| C@eccom.com.cn | ROUTING | TRANSFER |
| C@eccom.com.cn | STOREDRIVER | DELIVER |
邮箱A设置同时转发邮箱B，C发送邮件给A。
邮箱A日志
| Source | EventId |
| STOREDRIVER | RECEIVE |
| ROUTING | REDIRECT |
| ROUTING | REDIRECT |
| ROUTING | TRANSFER |
| STOREDRIVER | DELIVER |
邮箱B日志，注意日志Sender为C地址。
| Sender | Source | EventId |
| C@eccom.com.cn | ROUTING | TRANSFER |
| C@eccom.com.cn | STOREDRIVER | DELIVER |