| 代码 |
回应文字 |
错误理由 |
| 421,”4.4.5” |
Server busy, try again later. |
收件人的服务器忙碌中。 |
| 421,”4.7.0” |
IP not in whitelist for RCPT domain, closing connection. |
IP 位址不在收件人的白名单内。 |
| 421,”4.7.0” |
“Our system has detected an unusual rate of unsolicited mail originating from your IP address.To protect our users from spam, mail sent from your IP address has been temporarily blocked.” |
因发信者的 IP 位址发出大量的垃圾邮件，将其暂时封锁。 |
| 421,”4.7.0” |
Temporary System Problem. Try again later |
系统的暂时性问题，请稍后再试。 |
| 421,”4.7.0” |
TLS required for RCPT domain, closing connection. |
由于邮件未加密，收件端要求设定 TLS（邮件加密）。 |
| 450,“4.1.1” |
Recipient address rejected. unverified address: |
收件人的电子邮件地址未认证而被拒绝。 |
| 450,”4.2.1” |
“The user you are trying to contact is receiving mail too quickly.Please resend your message at a later time.If the user is able to receive mail at that time, your message will be delivered.” |
发送电子邮件时间间隔太短。 一定时间内有限制能够接收的信件量，且当发送的电子信件超过限制数量时，电子邮件可能会被拒绝接收。而为了避免发生这种状况，延迟电子邮件的发送时间的动作称为「节流」，因此才能稳定地发送电子邮件。） |
| 451,”4.3.0” |
Mail server temporarily rejected message. |
电子邮件服务器暂时拒绝接收邮件。 |
| 451,”4.4.2” |
Timeout – closing connection. |
作业逾时。 |
| 452,”4.2.2” |
The email account that you tried to reach is over quota. |
收件人的电子邮件容量已满。 |
