General information on LWS mail error codes

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When sending an email fails, an error message may appear or be returned to you by email. This message often contains an error code that quickly identifies the cause of the problem.

This help lets you find the appropriate documentation according to the displayed code. It does not detail every error: each family of codes has specific help with explanations and actions to take.

Before you start

Before looking for the solution, retrieve the complete error message. It may appear:

• in the bounce-back email received after a failed send;
• in your email software;
• in your Webmail;
• in the LWS interface if the block concerns a site or a PHP script.

The most important thing is to identify the exact code shown in the message: for example L-RATE, L-RCPT, L-SIZE, L-SPAM, L-IP, MAIL, LPI or even an SMTP code such as 550.

Find the help corresponding to your error code

Use the table below to identify the family of your error and consult the appropriate help.

I do not recognize the sends indicated in the error

If the error message indicates a large number of sends even though you did not send anything, it may be:

• an email address password compromise;
• an email client configured on a device you no longer use;
• a website that sends too many emails;
• a contact form exploited to send spam;
• a script installed on your hosting.

In this case, start by:

1. Changing the password of the email address concerned.
2. Updating this password in your email software.
3. Checking the devices connected to this address.
4. Checking the contact forms or sending scripts present on your website.
5. Consulting the help corresponding to the displayed error code.

How to check that the problem is solved?

After applying the recommendations in the help corresponding to your error code, perform another test send.

The problem is usually solved if:

• the email is sent correctly;
• you no longer receive a bounce-back error message;
• the same error code does not appear again;
• the block does not return after a few more sends.

Common issues

I cannot find the error code in the received message

Reread the full message, especially the lines containing terms such as error, blocked, rejected, SMTP, L-RATE, L-SPAM, 550 or 451.

If no LWS code is visible, it may be a classic SMTP error. In that case, see the help: Understanding the main email error codes and their meaning.

The block should have disappeared, but sending still fails

Some blocks require a delay before being lifted. If you immediately resend the same message or if the same behavior continues, the block may be extended or happen again.

Also check that the cause has indeed been fixed: number of recipients, size of attachments, invalid addresses, compromised password or overactive sending script.

The error concerns my website and not my mailbox

If the error appears when sending from a contact form, an online store, WordPress, Prestashop or a PHP script, consult instead the help related to codes LPI, LPB, LPO or the PHP function mail().

In that case, the problem does not necessarily come from your email address, but from the site or script trying to send the messages.

I do not know which help to consult

Note the exact code shown in the error message, then compare it with the table on this page. If the code does not appear, first look for the first letters or first numbers of the code.

For example:

• L-RATE01 or L-RATE02 → family L-RATEXX ;
• L-RCPT01 → family L-RCPTXX ;
• L-SIZE01 → family L-SIZEXX ;
• 550 → generic SMTP error.