SMTP error, RCPT TO: 550 5.1.1 User unknown
发布时间：2013-11-27 17:59:05
| 错误代码 | SMTP error, RCPT TO: 550 5.1.1 User unknown. |
| 形成原因 | 退信显示收件人地址不存在。 |
| 解决办法/流程 | 建议：
1.请先确认您是否将收件账号填写正确
2.请以其他方式联系收件域，核实收件域mx是否设置正确
3.如果mx指向是正确的，须收件域确认收件账号是否存在于系统内。 |
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