錯誤原因：因為收件人郵箱帳號不存在或者收件方郵件服務(wù)器無法找到收件人郵件地址，所以對方服務(wù)器不接收此封郵件。

可能出現(xiàn)的關(guān)鍵字：No such user、user unknown、unknown or illegal alias、account inactive、user not found、Invalid address、invalid recipient、not a valid mailbox、mailbox cannot be delivered、invalid rcpt to等。

可能出現(xiàn)的退信實例：

1) 550 Mailbox not found. http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728

2) 550 5.1.1 xxx@abcd.com: Recipient address rejected: User unknown

3) 550 5.1.1 Mailbox does not exist

4) 550 Mailbox not found

5) 550 User not found: 12345@163.com

6) 550 RC:LD The email account that you tried to reach does no exists.

7) 551 5.1.1 recipient is not exist

9) 550 #5.1.0 Address rejected.

10) 550 5.1.1 1111@ss.com: Recipient address rejected: undeliverable address: unknown user: "1111@ss.com"

11) 550 abcd:user not exist

12) 550 5.1.1 Bad destination mailbox address

13) 550 Local User [xxx@123.com] not found.

14) 550 no such user: ****@***.dbmailtest.**

15) 550 #2175041 unavailable mail user

16) 550 #5.1.0 Address rejected.

17) 552 "RCPT TO" mailbox unavailable

18) 550 5.1.1 ***@dbmailtest recipient rejected

19) 550 5.7.0 ***@dbmailtest... address invalid

20) 550 RC:NE The email account does not exist.

21) 550 no such user here (umail mta)

22) 550 5.1.1 xxx@abcd.com: Recipient address rejected: User unknown in virtual mailbox table

23) 550-5.1.1 The email account that you tried to reach does not exist. Please try

24) 550-5.1.1 double-checking the recipient's email address for typos or

25) 550-5.1.1 unnecessary spaces. Learn more at

27) 550 5.2.1 The email account that you tried to reach is disabled.

28) 550 Requested action not taken: mailbox unavailable

29) 5.1.0 - Unknown address error 550-'5.7.0 user access deny.'

30) ***@yahoo.com, 554 delivery error: dd This user doesn't have a yahoo.com account (***@yahoo.com) [-5] - mta155.mail.sc5.yahoo.com

31) 550 Invalid recipient: (RCPT TO:***@index.com.jo)

32) 550 ***@szonline.net unknown user account (RCPT TO:***@szonline.net)

33) 550 5.1.1 ... User unknown (RCPT TO:***@melco.com.hk)

34) …… invalid address

35) : host ……said: 550 5.7.1 Unable to relay for dbmailtest@126.com:host……said: 550 5.1.1 is not a valid mailbox

36) : host smtp.china.com[61.135.144.88] said: 550 , No such user.

37) ……user account inactive

38) …… unknown or illegal alias:dbmailtest

39) : User ***@163.net is not found in Server.

40) : host ……said: 550 Invalid recipient

解決方法：

1) 請確認(rèn)收件人地址是否正確

2) 聯(lián)系收件人，確認(rèn)郵箱地址是否存在。

確認(rèn)無誤后重新發(fā)送郵件即可。

2014-07-22 17:24

總結(jié)

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