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器無法找到收件人郵件地址，所以對方服務器不接收此封郵件。

可能出現的關鍵字：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) 請確認收件人地址是否正確

2) 聯系收件人，確認郵箱地址是否存在。

確認無誤后重新發送郵件即可。

2014-07-22 17:24

總結

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