Main email error codes and their meaning

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Main email error codes and their meaning

Email error messages are often difficult to understand for the uninitiated. This page will guide you through the error codes produced by email servers when your email fails to send.

Messages associated with the SMTP 550 error code 5.1.1

  • User unknown
  • No such user here.
  • This user doesn't have a yahoo.fr account.
  • Message rejected (no valid recipients)
  • Invalid recipient.
  • User not found.
  • Sorry, no mailbox here by that name.
  • ... is not a valid mailbox.
  • Requested action not taken: mailbox unavailable.
  • Recipient address rejected: User unknown in local recipient table.
  • The email account that you tried to reach does not exist.

Either you have made a mistake in the "user" section of your correspondent's address, or your correspondent's email account has been deleted.
Check the spelling, and if it was wrong, try sending again. You may also want to check that you haven't forgotten a full stop somewhere, or confused the hyphen in 6 with the hyphen in 8...

  • I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations.
  • A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed. This is a permanent error. The following address(es) failed.
  • Unable to deliver message to the following address(es).
  • Delivery to the following recipients failed permanently.

One or more recipients of your message have not received it. This error message is generally followed by another message of the type discussed below, containing the e-mail address(es) that caused the error.

  • Messages associated with the SMTP 550 error code 5.2.1
  • Mailbox disabled, not accepting messages.

Your correspondent's mailbox has been disabled, probably because he hasn't accessed it for a long time. All you have to do now is try to reach them by another means. They may be able to reactivate their mailbox simply by connecting to it.

Messages associated with SMTP error code 544 5.4.4

  • Host not found
  • Host unknown
  • Recipient address rejected: Domain not found.

Either you have made a spelling error in your correspondent's host, or your correspondent's "electronic postman" has broken down. Check the spelling of the host and try sending again.
It is also possible that your correspondent's host no longer exists. Check whether the corresponding website is still online.

Messages associated with SMTP error code 552 5.3.4

  • Message size exceeds fixed maximum message size.

You are trying to send a message which is too large (because of the attachment(s)) given the limits set by your e-mail system or by the recipient's system. If possible, send your attachments in several instalments, or use a service such as dl.free.fr.

Messages associated with SMTP error code 452 4.2.2 or 552 4.2.2

  • Disc quota exceeded.
  • Over quota.
  • Mailbox full.

Your correspondent's mailbox is full. All you have to do is send them a lighter message (without an image, for example) or phone them and ask them to delete messages from their inbox to free up space and be able to receive messages again...
You may receive this message without having written to anyone. In that case, your own e-mail account is saturated. Quickly go to your webmail to make room by deleting messages. Then, if you use email software (e.g. Outlook, Thunderbird, etc.), you may want to adjust the "Keep messages on server" and "Delete messages from server after XX days" settings.

Messages associated with SMTP error code 451 4.4.1 or 451 4.4.2

  • This is a warning message only. You do not need to resend your message. You do not need to resend your message.)
  • Warning: Cannot send message for past 4 hours. (Warning: Cannot send message for past 4 hours.)

Your correspondent's "electronic mailbox" is not responding. Your message has therefore been waiting for 4 hours. New attempts will be made automatically and regularly for a total of 5 days (leave it and wait). After this period, your message will be deleted. You will then receive a new error message. You can then try to send a message again, hoping that your correspondent's "electronic postman" is operational again.

Messages associated with SMTP error code 450 4.1.8

  • Sender address rejected: Domain not found.

Your e-mail software is probably incorrectly configured (your sender address is misspelled at host level). Check, correct and try again.

Messages associated with SMTP error code 550 or 554

  • Permission denied.
  • Connection refused.
  • Mail rejected by Windows Live Hotmail for policy reasons. The mail server IP connecting to Windows Live Hotmail has exhibited namespace mining behavior. The mail server IP connecting to Windows Live Hotmail has exhibited namespace mining behavior.)
  • Delivery temporarily suspended.
  • Messages from xxxxx temporarily deferred due to user complaints.

Your host has probably been banned (perhaps temporarily) by your recipient's host for being too lenient with spammers. The easiest way is to write to your correspondent from another address (with a different host). You can also wait 4 hours (temporary ban, see Yahoo! explanations) and then try to send the message again using your original address.

  • Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems.
  • Unfortunately, messages from [xxx.xxx.xxx.xxx] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). Please contact your ISP as part of their network is on our block list (S3140).
  • Client host rejected: Abuse detected GU_EIB_04 (message detected when trying to write to an SFR or Cegetel address...).
  • Spam detected

Your message has been blocked and rejected, either because it looked like spam, or because your host has a reputation for sending spam. Try to modify the content of your message (simplify it, remove unnecessary links, etc.), or send it from an address with a different host.

Messages associated with SMTP error code 451, 550 or 554

  • Too many errors from your IP.

You have probably sent the same message to many recipients (mailing), and unfortunately too many of the addresses are wrong. This situation is frequently encountered by spammers who do not keep their lists up to date. You are therefore suspected of spam and the electronic postman imposes a time delay on you.

Conclusion:

You are now in a position to understand and resolve the problems of sending email on your web hosting with LWS.

Don't hesitate to share your comments and questions!

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Questions sur l'article
kal drogo Il y a 735 days
je ne parvient pas à publié mon site internet, dans lws on affiche ''domaine suspendu''. comment puis je faire?
See the
1 answers
fabrice-LWS - Il y a 735 days
Bonjour, votre domaine est actuellement suspendu par le registre suite à une non-vérification d'identité. Vous avez dû recevoir un email de leur part fin aout concernant cette demande avec un lien dans ce dernier permettant de confirmer votre adresse e-mail. Je vous invite à relancer la procédure en mettant à jour vos informations. Pour cela, connectez-vous à votre espace client LWS, cliquez sur "Votre identifiant" puis sur "Éditer coordonnées". Cliquez en bas de page sur le bouton "Sauvegarder". Cela aura pour effet de relancer, auprès du registre, la demande de vérification. Vous devriez recevoir, dans l'heure suivante, un email dans lequel se trouve un lien permettant de confirmer votre adresse email, ce qui aura pour effet, la levée de suspension de votre domaine.
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