Smtp error message list

SMTP Error Messages

SMTP Response Codes and Errors

Simple Mail Transfer Protocol (SMTP) is an internet standard for email transmission.
SMTP is a text based protocol in which the sender communicates with the mail receiver by issuing commands and receiving a response code.

Sample:

C: MAIL FROM:
S: 250 Ok

In this sample the client issues the MAIL FROM command and the server replies with 250 Ok.

The following (incomplete) list of response codes and error messages should help finding errors in your mail settings.
It contains common problems and error messages.

SMTP Error 221

221 Service closing transmission channel
221 Closing transmission
221 Goodbye

Error 221 is an authentication error, which means you are using the wrong mail server, the user/password is incorrect, you need to change the authentication method or SMTP access is not enabled for your email account. Try using SSL/TLS if you are sure that the mail server and user/password is correct.

Note: SMTP access in disabled by default on some accounts, e.g. when using Gmail you need to enable «less secure apps» (third party apps) in the Gmail settings: https://support.google.com/accounts/answer/6010255?hl=en

SMTP Error 421

421 Temporary System Problem. Try again later.
421 Try again later, closing connection.
421 Server busy, try again later.

The SMTP error 421 is normally used for temporary problems on the mail server or a problem with the recipients email account.
Some mail providers might also return 421 after you reached a limit (restriction) on your mail account (see SMTP Error 451 below).

SMTP Error 451

451 4.3.0 Mail server temporarily rejected message
451 You have exceeded your messaging limits

If you receive one of the above (or a similar) error message from your mail server (after you’ve sent out some messages), then you have reached a limit on your mail server (or email account). This means your mail server will not accept any further messages until you waited some time.

Your mail account might have one or multiple limitations:

  • Daily mail limit, e.g. max. 2000 messages per day
  • Hourly mail limit, e.g. max. 500 messages per hour
  • Message submission rate limit

Note: No mail software can send more messages as your mail server (or email account) allows. It’s a limitation of the used email account and not a program limit or software bug. Please contact your mail administrator or mail provider for further details on your account limits for SMTP mail (outgoing messages).

If the used email account is too restrictive, use a different email account (and mail server) instead. It’s recommended to use an email account from your own domain (website), your company mail server or a business email account. In general a business account should have less mailing restrictions than a free account.

SMTP Error 530

530 Authentication Required
530 5.7.0 Must issue a STARTTLS command first

Check the authentication (username/password) and enable SSL/TLS (StartTLS) in the account settings of your mail client, if required.
If you are using MailList Controller, change the authentication method to «StartTLS» (Details).

SMTP Error 550

550 Requested action not taken: mailbox unavailable [E.g., mailbox not found, no access]
550 5.7.1 unable to relay for
550 The email account that you tried to reach is disabled
550 Invalid recipient
550 No such user here

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You will get this error when you try to send an email to an invalid email address or if you need to authenticate before sending an email.
Some providers also use error 550 to indicate that you reached your send (relay) limit:

550 5.4.5 Daily sending quota exceeded
550 5.7.1 Email quota exceeded
550 5.7.1 Daily SMTP relay limit exceeded for customer

See: «SMTP Error 553» (below) for details.

SMTP Error 553

553 Requested action not taken: mailbox name not allowed
553 Mailbox name invalid

Check the recipient’s email address: either the email address does not exist or there is a syntax error. Also check additional recipients in CC and BCC.

553 Sorry, over your daily relay limit
553 Too many mail
553 Quota exceeded

If you receive one of the above (or a similar) error message from your mail server (after you’ve sent out some messages), then you have reached a limit on your mail server (or email account). This means your mail server will not accept any further messages until you waited some time.

Your mail account might have one or multiple limitations:

  • Daily mail limit, e.g. max. 2000 messages per day
  • Hourly mail limit, e.g. max. 500 messages per hour
  • Message submission rate limit

Note: No mail software can send more messages as your mail server (or email account) allows. It’s a limitation of the used email account and not a program limit or software bug. Please contact your mail administrator or mail provider for further details on your account limits for SMTP mail (outgoing messages).

If the used email account is too restrictive, use a different email account (and mail server) instead. It’s recommended to use an email account from your own domain (website), your company mail server or a business email account. In general a business account should have less mailing restrictions than a free account.

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SMTP and ESMTP Error Code List

4 Minutes, 5 Seconds to Read

It is important to figure out why your email bounces. If you receive an email bounce, you can look in the bounce message to find the proper error code that will give you the reason for the bounce. Below is a list of the Standard SMTP error codes and the Extended SMTP (ESMTP) error codes.

SMTP Error Codes

This list of codes is the standard SMTP error codes you will find in most email bounces.

200 Codes

  • 211 – System status / system help reply
  • 214 – Help message
  • 220 – Domain service ready
  • 221 – Domain service closing transmission channel
  • 250 – Requested mail action completed and OK
  • 251 – Not Local User, forward email to forward path
  • 252 – Cannot Verify user, will attempt delivery later
  • 253 – Pending messages for node started

300 Codes

  • 354 – Start mail input; end with .
  • 355 – Octet-offset is the transaction offset

400 Codes

  • 421 – Domain service not available, closing transmission channel
  • 432 – Domain service not available, closing transmission channel
  • 450 – Requested mail action not taken: mailbox unavailable. request refused
  • 451 – Requested action aborted: local error in processing Request is unable to be processed, try again
  • 452 – Requested action not taken: insufficient system storage
  • 453 – No mail
  • 454 – TLS not available due to temporary reason. Encryption required for requested authentication mechanism
  • 458 – Unable to queue messages for node
  • 459 – Node not allowed: reason
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500 Codes

  • 500 – Syntax error, command unrecognized
  • 501 – Syntax error in parameters or arguments
  • 502 – Command not implemented
  • 503 – Bad sequence of commands
  • 504 – Command parameter not implemented
  • 510 – Check the recipient address
  • 512 – Domain can not be found. Unknown host.
  • 515 – Destination mailbox address invalid
  • 517 – Problem with senders mail attribute, check properties
  • 521 – Domain does not accept mail
  • 522 – Recipient has exceeded mailbox limit
  • 523 – Server limit exceeded. Message too large
  • 530 – Access Denied. Authentication required
  • 531 – Mail system Full
  • 533 – Remote server has insufficient disk space to hold email
  • 534 – Authentication mechanism is too weak. Message too big
  • 535 – Multiple servers using same IP. Required Authentication
  • 538 – Encryption required for requested authentication mechanism
  • 540 – Email address has no DNS Server
  • 541 – No response from host
  • 542 – Bad Connection
  • 543 – Routing server failure. No available route
  • 546 – Email looping
  • 547 – Delivery time-out
  • 550 – Requested action not taken: mailbox unavailable
  • 551 – User not local; please try forward path
  • 552 – Requested mail action aborted: exceeded storage allocation
  • 553 – Requested action not taken: mailbox name not allowed
  • 554 – Transaction failed

Extended SMTP (ESMTP) standards

The Extended SMTP error codes work in 3 digit combinations. For example, 5.2.1 is a Permanent Error where the receiving email is not accepting messages. The first number is the email message status. The second 2 numbers pinpoint the exact information bout the error.

  • 2Successfully sent the email;
  • 4Temporary problem when sending the email. The email server typically will try to send it again till it reaches retry timeout.
  • 5Permanent or Fatal error. This can be caused by a non existent email address, DNS problem, or your email was blocked by the receiving server.

Below is a list of the Extended SMTP error codes.

Note! X can be a 4 or a 5 depending on is its Temporary or Permanent.

x.1.x Codes

  • X.1.0 – Other address status
  • X.1.1 – Bad destination mailbox address
  • X.1.2 – Bad destination system address
  • X.1.3 – Bad destination mailbox address syntax
  • X.1.4 – Destination mailbox address ambiguous
  • X.1.5 – Destination mailbox address valid
  • X.1.6 – Mailbox has moved
  • X.1.7 – Bad sender’s mailbox address syntax
  • X.1.8 – Bad sender’s system address

x.2.x Codes

  • X.2.0 – Other or undefined mailbox status
  • X.2.1 – Mailbox disabled, not accepting messages
  • X.2.2 – Mailbox full
  • X.2.3 – Message length exceeds administrative limit
  • X.2.4 – Mailing list expansion issue

x.3.x Codes

  • X.3.0 – Other or undefined mail system status
  • X.3.1 – Mail system full
  • X.3.2 – System not accepting network messages
  • X.3.3 – System not capable of selected features
  • X.3.4 – Message too big for system
  • X.3.5 – System incorrectly configured

x.4.x Codes

  • X.4.0 – Other or undefined network or routing status
  • X.4.1 – No answer from host
  • X.4.2 – Bad connection
  • X.4.3 – Routing server failure
  • X.4.4 – Unable to route
  • X.4.5 – Network congestion
  • X.4.6 – Routing loop detected
  • X.4.7 – Delivery time expired

x.5.x Codes

  • X.5.0 – Other or undefined protocol status
  • X.5.1 – Invalid command
  • X.5.2 – Syntax error
  • X.5.3 – Too many recipients
  • X.5.4 – Invalid command arguments
  • X.5.5 – Wrong protocol version
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x.6.x Codes

  • X.6.0 – Other or undefined media error
  • X.6.1 – Media not supported
  • X.6.2 – Conversion required and prohibited
  • X.6.3 – Conversion required but not supported
  • X.6.4 – Conversion with loss performed
  • X.6.5 – Conversion failed

x.7.x Codes

  • X.7.0 – Other or undefined security status
  • X.7.1 – Delivery not authorized, message refused
  • X.7.2 – Mailing list expansion prohibited
  • X.7.3 – Security conversion required but not possible
  • X.7.4 – Security features not supported
  • X.7.5 – Cryptographic failure
  • X.7.6 – Cryptographic algorithm not supported
  • X.7.7 – Message integrity failure

29 Comments

Hi, my name is Christianah
Am looking for some help with this which i don’t know how to fix it :

550 5.7.1 This message is rejected by our SPAM filters. Please refer https://support.mailhostbox.com/email-administrators-guide-error-codes/ for more information

‘*********@********’ on 03/03/2020 12:23 PM
550 5.7.1 This message is rejected by our SPAM filters. Please refer https://support.mailhostbox.com/email-administrators-guide-error-codes/ for more information

‘*********@********’ on 03/03/2020 12:23 PM
550 5.7.1 This message is rejected by our SPAM filters. Please refer https://support.mailhostbox.com/email-administrators-guide-error-codes/ for more information

Thank you for your comment. Unfortunately, it appears that your email messages are being flagged as spam by the recipient server and cannot be delivered. One of the reasons for this may be that you do not have DMARC records configured for your domain name. I recommend ensuring that you have configured the DMARC records for that domain as per the instructions on the following guide:

If you are still receiving this error after setting up DMARC records I recommend contacting our 24/7 Technical Support team by emailing [email protected], calling 888.321.HOST(4678), or by starting a chat session via your Account Management Panel.

Best Regards,
Alyssa K.

i need to know what type of error is this….. Error: “552 5.2.0 ESMTP server not available AUP#I-1340″…

This seems to indicate that the server was not available when email was trying to be relayed there.

I always get a success on $mail->Send() using the code above. For a valid TO email address, I get the email and everything is fine. However, how do I view the logs to find out why an email send failed?

For instance, if I specify an AddAddress of [email protected], it still says “Message has been sent” … I need a way to find out if the email was actually rejected. Where is that log located on the InMotion server? Thx!

I’d advise reading this article about checking the exim mail log.

i’m currently found error code like Error: “452 4.1.0 ESMTP server temporarily unavailable AUP#I-1370”

may i know why this error repeating in my server how to avoid this problem

This error appears to indicate that there is a disruption in the ability to connect to the server, however, only temporarily. If this is repeatedly occurring, I recommend reviewing your email/website activity to ensure you are not overutilizing server resources.

i got this error code [SMTP protocol failure: syntax error: 3-digit code not found; ] simentanuosly durring mailling what kind of error this is and how can i rectify this error

If you do not have an error code you will need to contact your hosting provider so they can review the mail server logs to see whats going on.

Each of the following recipients was rejected by a remote mail server.

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