Typo3 10.4.16 SMTP error (Expected response code "250" but got code "451") while sending form

TYPO3 Questions Extensions
1

Hi there,

I receive an error while sending a contact form using SMTP on a Typo3 10.4.16. The “Test Mail Setup” in the backend sends correctly, but once I start using a form, I receive the following error:

Expected response code “250” but got code “451”, with message “451 4.3.0 pymilter: untrapped exception in pythonfilter”.

I use the following Mail Setup:

    'format' => 'html',
    'transport' => 'smtp',
    'transport_sendmail_command' => '',
    'transport_smtp_encrypt' => true,
    'transport_smtp_password' => '****',
    'transport_smtp_server' => '****.netcup.net:465',
    'transport_smtp_username' => '****@****.cloud',

The test mail is delivered w/o any problem. What do I miss here?

Thanks for hints

Thomas

2

The error message you are encountering, “451 4.3.0 pymilter: untrapped exception in pythonfilter,” indicates that there is an issue on the SMTP server side, specifically related to the pymilter Python filter. This error is not directly related to your TYPO3 configuration but rather to the server that is processing your email.

Here are some steps you can take to troubleshoot and resolve this issue:

  1. Contact Your SMTP Provider: Since the error is coming from the SMTP server, reaching out to your SMTP provider (in this case, netcup.net) would be a good start. They can provide more insight into the server-side issue and help you resolve it.

  2. Check SMTP Server Logs: If you have access to the SMTP server logs, check them for more detailed error messages. This can help pinpoint the exact cause of the problem with the pymilter Python) filter.

  3. Review SMTP Configuration: Ensure that your SMTP configuration is correct. Double-check all parameters, especially encryption settings and port numbers. Here is a more detailed example of a typical TYPO3 SMTP configuration:

    $GLOBALS['TYPO3_CONF_VARS']['MAIL'] = [
    'transport' => 'smtp',
    'transport_smtp_server' => '.netcup.net:465',
    'transport_smtp_encrypt' => 'ssl',
    'transport_smtp_username' => '@.cloud',
    'transport_smtp_password' => '',
    'defaultMailFromAddress' => 'your-email@example.com',
    'defaultMailFromName' => 'Your Name',
];

  4. Update and Test: Make sure that TYPO3 and all its extensions are updated to the latest versions. Sometimes, bugs in older versions can cause issues that have been resolved in updates.

  5. Use a Different SMTP Server: As a temporary workaround, you might want to try using a different SMTP server to see if the issue persists. This can help you determine if the problem is specific to the current SMTP server.

  6. Check for Email Content Issues: Sometimes, the content of the email being sent can cause issues. Try sending a simple text email to see if it goes through without errors. If it does, gradually add complexity to the email content to identify what might be causing the issue.

  7. Test with a Different Email Client: Use a different email client or script to send an email through the same SMTP server with the same credentials. This can help determine if the issue is specific to TYPO3 or if it’s a more general server issue.

  8. Disable pymilter Filter: If you have control over the SMTP server, consider temporarily disabling the pymilter Python filter to see if that resolves the issue. However, this should be done with caution and typically in a testing environment to avoid potential security risks.

If you continue to experience issues, providing additional details such as server logs or specific configurations can help narrow down the problem further.

3

@zainkhan Do not use advertising links in your post! As an admin I removed it.

4

This content has been removed due to violoation of our terms.

5

@zainkhan You have repeatedly disregarded our terms. Your my.typo3.org account has been suspended.

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