Alibaba Mail:Common Bounce Notification and Solutions

Prompt information

Return Reason

Solution

spamed by local spam engine

The message was rejected by the anti-spam system as having spam characteristics.

Bounce Notification: spamed by local spam engine

• 454 Transient reject by behaviour spam...

• 554 Reject by behaviour spam...

Behavioral anti-spam phase rejection

1. The sender's sending frequency or number exceeds the limitation of Alibaba Mail.

2. The sender's sending IP or domain name is detected to be blacklisted in the anti-spam organization, judging that the credibility is low and there is spam sending behavior. In order to prevent the Alibaba Mail system from being harassed by malicious emails from such low-reputation IP addresses, the Alibaba Cloud system may refuse to receive such mails from the sending IP address or domain name.

• Bounce Notification: 454 Transient reject by behaviour spam

• Bounce Notification: 554 Reject by behaviour spam

502 Mailfrom account is a local account

When the Alibaba Mail user uses a local email client to send emails, you need to set the sending server specified by the Alibaba Mail. The server address for sending emails is smtp.qiye.aliyun.com and the port is 25. If you set the server of the on-premises client to the address of a proxy server or other server, this error will be returned when the Alibaba Mail user sends emails to other mailboxes in the Alibaba Cloud system.

Bounce Notification: 502 Mailfrom account is a local account

503 Rcptto account isn't a local account

1. The recipient has used the Alibaba Mail. The sender misspelled the recipient's email account.

2. The recipient used the Alibaba Mail before and has now changed to a non-Alibaba Mail system, but the system still saves the domain records of previous email service.

Bounce Notification: 503 RCPT account isn't a local account

504 the number of RCPT attempts is achieved the maximum threshold

You have exceeded the maximum number of email sending.

Please control the number of emails sent and resend them the next day.

505 the total of RCPTs is achieved the maximum threshold

Your sending frequency has exceeded the limit.

Please reduce the sending frequency.

510 The length of DATA content is achieved the maximum threshold

The email body exceeds the maximum number of words.

Please reduce the email content appropriately before sending.

510 The length of Attach is achieved the maximum threshold

The attachment size exceeds the maximum limit.

Please adjust appropriately before sending.

510 The number of attachments is achieved the maximum threshold

The number of attachments exceeds the upper limit.

Please reduce the number of attachments before sending.

526 Authentication failure

The error code returned because the authentication has failed.

Bounce Notification: 526 Authentication failure

541 This account isn't allowed to send email

Blocking outgoing emails for reasons such as sending spam or being stolen.

Alibaba Mail Employee Account Unban

550 mailbox is full

The recipient's mailbox is full. Notify the recipient to clean up the memory before sending.

Bounce Notification: 550 mailbox is full

554 Reject by content spam

If the email is judged as spam, you can adjust the current sending content and try to send it again. Or provide the sending address, receiving address, and time when submitting the ticket, and the service personnel will assist in checking whether the system judgment is too strict.

Bounce Notification: 554 reject by content spam

Bounce Notification

Return Reason

Solution

the mta server of ...(x.x.x.x) reply:...

The email is rejected by the recipient server, and error semantics are mostly returned to the recipient.

Refer to Semantics or consult the recipient's email administrator or service provider.

Bounce Notification: the mta server of... reply

User not found

The delivery failed because the receiving address format is incorrect or the address does not exist.

1. Check whether the recipient address is incorrect, such as extra spaces or special characters.

2. Check whether the MX resolution of the recipient is correctly configured. If there is an invalid MX resolution, please contact the email administrator of the recipient.

3. Contact the recipient through other methods to check whether the mailbox is expired, disabled, or frozen.

User unknown, Invalid User, and No exist

550 No such user

550 Mailbox not found

invalid address (#5.5.0)

550 Mail content denied

Dns, Host, Not found, Bad host, Domain, and Unreachable

The domain name is not recognized by the text that follows the @, or the DNS does not resolve the domain name.

1. Please verify that the recipients' address is correct and send it again.

2. You can use the email address of another email service provider to send the email to the recipient for testing and check whether a refund occurs.

Sorry, I couldn' t find any host named xxx. (#5.1.2)

Quota exceeded

1. The remaining capacity of the recipient's mailbox is not enough to receive the mail, or the size of the mail exceeds the limit of the recipient' s system for a single mail.

2. The mail volume is so large that it exceeds the maximum limit for the recipient to receive a single mail.

1. If the capacity of the recipient account is full, please check Methods for Handling Email Reception Issues due to Full Storage Space.

2. If the message exceeds the recipient's size limit for a single email, please send it with the large attachment.

mailbox is full

Quota exceed the hard limit for user

mailbox space not enough

552 5.7.0 content and attachment content guidelines

Too large, Maximum fixed size

552 Message size exceeds fixed limit

Rejected, Not allowed, and Message blocked

Rejected by the recipient, usually caused by the anti-spam policy of recipient's server.

The recipient needs to remove your sending address from the blacklist. Or you may directly notify the recipient to contact their email service provider to check the specific reason for the rejection.

552 Error: content rejected, 553 Mail data refused

Black list, Spam, and Spammers

The recipient determines that the email is spam and rejects it.

There are many reasons for rejecting the email. You need to analyze the specific semantic judgment returned by the recipient. We recommend that you optimize the email content and try again.

If the semantic is not clear, we suggest that you may check with the administrator or service provider of the recipient to analysize and release.

Connection timed out, 554 delivery error

Due to network reasons, the connection to the server of the recipient timed out, which caused an error in the delivery of this mail.

It is caused by the service failure of the recipient's email server or the poor quality of network interconnection. In addition, the system will automatically try to transfer such delivery to the Alibaba Cloud overseas post office responsible for the relay for redelivery to improve the delivery success rate. Suggestions for improvement are as follows:

• You can retry delivering this email later.

• Please contact the recipient by other means to confirm whether the recipient's mail server is currently stable.

Error in command, Syntax error

Incorrect email system instructions that cannot be recognized, the other system cannot recognize this software or the instruction system of the sender system.

Please use Outlook Express, Foxmail for editing, or directly use the Webmail to send mail.

Remote host said: 553 Too many recipients in the mail, should less than 20

Mass mailing contains too many users.

You can send an email to this address alone, or reduce the number of people receiving emails at the same time.

542 This account isn't allowed to receive email

Due to address restrictions, you are not authorized to send emails to this account.

Please contact the recipient of this account through other methods, and ask the recipient to contact their email administrator to confirm the authorization before re-delivery.

422 ERR.LOGIN

An unknown error occurred during mail delivery during sending to the other party's server.

1. Contact your email provider for assistance in troubleshooting.

2. A network application (telecom, network, mobile, etc.) exception may cause a temporary error during the mail transmission process, and the sending can be retried later.

the mta server of xxx reply:550 failed to meet SPF requirements

The SPF policy of the mail recipient server detects that the identity authentication fails.

Bounce Notification: Spf check failed

spf check failed

521 5.2.1 : AOL will not accept delivery of this message

The email content is suspected of mass sending, is judged to be spam or complained by most recipients as spam, or is advertising and promotion mail, so the other mailbox is not allowed to receive the content of the sent mail.

We recommend that you send a simple test email to the recipient to check whether the delivery is successful.

451 Temporary local problem - please try later

The recipient server is temporarily abnormal, causing the mail delivery to fail.

Re-delivery later. If it is still invalid, contact the recipient by other means, and the recipient will give feedback to their email service provider in a timely manner.

550 5.7.1 Service unavailable; Client host [x.x.x.x] blocked using Trend Micro RBL+

The sending IP address of the sending party is blacklisted by the anti-spam system of the receiving party.

Please give feedback to the recipient and contact the recipient's mailbox administrator or service provider to release.

Recipient address rejected: User unknown in virtual mailbox table (in reply to RCPT TO command)

The receiving email address was not found in the system of the other server.

Please re-verify the accuracy of the email address and retry the delivery.

• 550 Sender domain is a local domain.

• 550 Connection denied

• 550 Mail is rejected by recipients.

• 550 Mailbox unavailable or access denied

• 501 Bad address syntax

• 552 Message too large

• 550 Mailbox not found

• 550 Mail content denied

• 550 Ip frequency limited

• 550 Domain frequency limited

• 550 Sender frequency limited

• 550 Connection frequency limited

The recipient's server returns the return semantics. For more information, please see the explanation of the recipient's server.

https://open.work.weixin.qq.com/help2/pc/20038?person_id=1&id=20022

421 Service not available, closing transmission channel

Service or network exceptions

Please send an email to test later.

524 username or password is NULL

Account or password error

Please check whether the account and password are correct, verify that they are accurate, and then test the sending letter.

523 cipher text is invalid base64 format

Incorrect encoding

Please adjust the encoding format before trying to send a letter.

450 "MAIL FROM" mailbox unavailable

Incorrect sender address

Please check whether the email account of the recipient is spelled correctly before trying to send the email.

552 "RCPT TO" mailbox unavailable

Receiving address is invalid

Check whether the recipient's account is available to receive emails.

451 Requested action aborted: local error in processing

Receiving server exception

Check your local terminal for problems. We recommend that you restart the service before sending the service.

550 failed to meet SPF requirements

The SPF verification fails.

How to Configure the SPF Resolution of a Domain Name to avoid Bounce-backs

551 virus infected mail rejected

This message may contain a Trojan or virus

Please discontinue the email sending and send it again.

534 Message is too long

The message body exceeds the maximum number of words.

Please reduce the body content appropriately before sending.

521 5.2.1: AOL will not accept delivery of this message

The recipient's server rejected this email.

Contact the recipient's email service provider for help.

451 Requested action aborted: local error in processing

Please check whether there is a problem with your local terminal

We recommend that you restart the service before sending.

400 Temporary failure

Troubleshooting

Please try sending again.

551 virus infected mail rejected

Message contains a virus

Please clean up the email content and retry the delivery.

resolving by dns failed

1. Receiving address is wrong

2. The MX server of recipient is abnormal.

1. Please check whether the recipient address entered is incorrect.

2. Contact the recipient to confirm whether the MX resolution of its domain name exists and whether the DNS resolution is correct. If they confirm that the receiving domain exists, please try to send it again later.

57 This email is rejected. It contains keywords rejected by the antispam content filter

The email content sent hit the keyword in the recipient's anti-spam system.

Retry the delivery after adjusting the email content.

521 5.2.1 : AOL will not accept delivery of this message

The body is suspected of mass sending, is judged to be spam or complained by most recipients as spam, or is advertising and promotion mail, so the other mailbox is not allowed to receive the content of the sent mail.

We recommend that you send a simple test body to the other party to check whether the delivery is successful.

451 Temporary local problem - please try later

The recipient server is temporarily abnormal, causing the mail delivery to fail.

Retry the delivery. If it fails, you must contact the recipient's email service provider for confirmation.

550 Message is too large /Too large/Maximum fixed size/ 552 Message size exceeds fixed limit

The email volume is too large and exceeds the maximum limit for receiving a single email from the other party.

Please split and send the message to be sent.

550 5.7.1 Service unavailable; Client host [x.x.x.x] blocked using Trend Micro RBL+

The sending IP address of the sending party is blacklisted by the anti-spam system of the receiving party.

Submit a ticket to apply for unsealing.

Recipient address rejected: User unknown in virtual mailbox table (in reply to RCPT TO command)

The receiving email address was not found in the system of the recipient's email server.

Please re-verify the accuracy of the email address and retry the delivery.

Mail service provider

Description of return code

Tencent mailbox

https://open.work.weixin.qq.com/help2/pc/20038?person_id=1&id=20022

Netease mailbox

https://qiye.163.com/help/l-9.html

263 mailbox

https://www.263.net/263/helpcenter/mailbounce/20150906/842.html

Gmail mailbox

https://support.google.com/a/answer/3726730

Microsoft email (@hotmail.com, @live.com, @live.cn, @outlook.com, etc.)

• https://mail.live.com/mail/troubleshooting.aspx#errors

• https://learn.microsoft.com/zh-cn/exchange/troubleshoot/email-delivery/ndr/non-delivery-reports-in-exchange-online