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SMTP: rejection/error codes


Код Описание
101 The server is unable to connect
111 Connection refused or inability to open an SMTP stream
211 System status message or help reply
214 A response to the HELP command
220 The server is ready
221 The server is closing its transmission channel, It can come with side messages like "Goodbye" or "Closing connection"
250 Its typical side message is "Requested mail action okay completed": meaning that the server has transmitted a message
251 "User not local will forward": the recipient's account is not on the present server, so it will be relayed to another
252 The server cannot verify the user, but it will try to deliver the message anyway
354 The side message can be very cryptic ("Start mail input end ."), It's the typical response to the DATA command
420 "Timeout connection problem": there have been issues during the message transfer
421 The service is unavailable due to a connection problem: it may refer to an exceeded limit of simultaneous connections, or a more general temporary problem
422 The recipient's mailbox has exceeded its storage limit
431 Not enough space on the disk, or an "out of memory" condition due to a file overload
432 Typical side-message: "The recipient's Exchange Server incoming mail queue has been stopped"
441 The recipient's server is not responding
442 The connection was dropped during the transmission
446 The maximum hop count was exceeded for the message: an internal loop has occurred
447 Your outgoing message timed out because of issues concerning the incoming server
449 A routing error
450 "Requested action not taken – The user's mailbox is unavailable", The mailbox has been corrupted or placed on an offline server, or your email hasn't been accepted for IP problems or blacklisting
451 "Requested action aborted – Local error in processing", Your ISP's server or the server that got a first relay from yours has encountered a connection problem
452 Too many emails sent or too many recipients: more in general, a server storage limit exceeded
471 An error of your mail server, often due to an issue of the local anti-spam filter
500 A syntax error: the server couldn't recognize the command
501 Another syntax error, not in the command but in its parameters or arguments
502 The command is not implemented
503 The server has encountered a bad sequence of commands, or it requires an authentication
504 A command parameter is not implemented, Bad email address, Bad email address, A DNS error: the host server for the recipient's domain name cannot be found
513 "Address type is incorrect": another problem concerning address misspelling, In few cases, however, it's related to an authentication issue
523 The total size of your mailing exceeds the recipient server's limits
530 Normally, an authentication problem, But sometimes it's about the recipient's server blacklisting yours, or an invalid email address
541 The recipient address rejected your message: normally, it's an error caused by an anti-spam filter
550 It usually defines a non-existent email address on the remote side
551 "User not local or invalid address – Relay denied",
Meaning, if both your address and the recipient's are not locally hosted by the server, a relay can be interrupted, 552 "Requested mail actions aborted – Exceeded storage allocation": simply put, the recipient's mailbox has exceeded its limits
553 "Requested action not taken – Mailbox name invalid", That is, there's an incorrect email address into the recipients line
554 This means that the transaction has failed, It's a permanent error and the server will not try to send the message again.

Расширенное описание ошибок

550 5.1.1 Recipient address rejected: User unknown in virtual alias table

This is the bounce back message that is received by the sender from our server if the destination email address does not exist. The same error message is received if the recipient has a mail loop. That is, if the recipient has set a forward to another email address and that email address is forwarded back to the original one. In this case, you need to remove the loop in order to receive the emails.

If there is a forward set for an account, and an email is sent to that account, if for some reason the forwarded email is not sent, the original sender may get the above error.

For example, [email protected] if forwarded to [email protected], if a third user [email protected] emails to [email protected], he may get the above error if the forwarded email is bounced.

550 5.1.1 Protocol error

This error code ideally suggests that the sender has used SMTP protocol instead of ESMTP, thus the outbound mail of the sender was rejected. In short, the sending client doesn't properly communicate and makes errors in the SMTP protocol.

550 5.3.2 Service currently unavailable

The error code 5.3.2 usually means that the system is not accepting network messages. We would thus need to look outside Exchange for a connectivity problem.

The error code ideally occurs ideally for two reasons which are listed below:

  1. The sending IP is blacklisted at an RBL or blacklist monitoring site. (You may verify the same by inputting the IP via this link: http://mxtoolbox.com/blacklists.aspx )
  2. There is a temporary block on the IP on our Inbound server due to multiple mails from this IP. Feel free to contact our support desk for more information and regarding de-listing the same.
  3. If sending IP does not have a reverse PTR record configured. Reference URL: http://mxtoolbox.com/NetworkTools.aspx

554 5.7.1 Service unavailable; Client host X.X.X.X blocked using zen.spamhaus.org

This is the error message that is received of the IP address of the sender is listed at zen.spamhaus.org
For further details, please check http://www.spamhaus.org/zen
OR check http://www.spamhaus.org/query/bl?ip= and contact zen.spamhaus.org to get the IP De-listed.

550 5.7.1 : Helo command rejected: You aren't localhost

550 5.7.1 : Helo command rejected: You aren't localhost.localdomain.
550 5.7.1 : Helo command rejected: You are not me

Our servers do not accept SMTP HELO command as HELO localhost or HELO localhost.localdomain or HELO . We accept HELO from a valid Domain Name or your computer name which is other than your domain name. Please check with your ISP or Mail administrator for this issue.

554 5.7.1 : Relay access denied

There are couple of reasons for this error while sending an email
Please contact support.

551 5.7.1 The message was rejected due to classification as Virus,Spam or high bulk ratio

This is a bounce back message that you receive when an email is classified as spam while sending out. If you feel that a genuine email is rejected as spam, you need to send the same email with the full headers and the content to our support team. That email in question will be reviewed manually.

530 5.7.0 Recipient address rejected: Authentication Required

This error comes when your sending mails to remote domain without using smtp authentication.

550 5.4.5 Recipient address rejected: Hourly domain sending quota exceeded

This is the error message that you get if your domain name exceeds the hourly quota set for the domain name. Here, the term 'hour' refers to the last 60 minutes.

550 5.4.6 Recipient address rejected: Hourly sending quota exceeded

This is the error message that you get if the user (that particular email address) exceeds the hourly quota set. Here, the term 'hour' refers to the last 60 minutes.

553 5.7.1 Sender address rejected: not owned by user [email protected]

This is the error message that is received when you are trying to send an email as a different user.

554 5.7.1 : Recipient address rejected: USER IS SUSPENDED

This error comes if user is suspended in Control Panel.

522 5.7.1 : Recipient address rejected: Requested mail action aborted: exceeded storage allocation

This error comes if the user is overquota.

554 5.7.1 : Sender address rejected: Access denied

This error comes when the sender address is blocked on our server. Generally this is done if spam has originated from this user.

450 4.1.8 : Sender address rejected: Domain not found

Our inbound servers require that the hostname for the sender server should have valid MX or A records in order to accept emails from it. You need to contact the sending server's email admin to add valid DNS records for his server.

450 4.7.1 Client host rejected: cannot find your reverse hostname

Our inbound servers require reverse hostname for the sender server to be present in order to accept the email. You need to contact the reverse hostname's email admin to add the rDNS to into his server.

450 4.7.1 : Recipient address rejected: Policy Rejection- Quota Exceeded

This error comes from our incoming mail server if user is receiving excessive amounts of mails.

450 4.7.1 Recipient address rejected: Access denied

This occurs when the recipient address is invalid. i.e., not in form of user@domainname OR if the Recipient address is blocked on server.

451 4.3.5 Server configuration problem - try again later

451 4.7.1 Service unavailable - try again later;
This error most likely occurs if there is a configration error with our servers. If you encounter any of the above messages, please contact our support with the details.

452 4.5.3 Error: too many recipients

The error message is encountered when the user is exceeding the limit of more than 50 recipients in an email. The list of recipients is inclusive of To,Cc and Bcc. If you encounter the above error, reduce the number of recipients in the email and try again.

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linux/mail/smtp_error_codes.txt · Последнее изменение: 2020/04/16 14:21 —