Sending mails failed | WordPress.org

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No emails are sent for a contact form. It is configured so that the person who has filled out the form and the operator of the website (not the admin of the site) receives an email.

My customer has copied a contact form and only changed the recipient.
Now I have noticed that no mails are arriving here. However, there is a success message on the form.

I have installed WP Mail SMTP to find the problem.

The following is reported:
PHPMailer was able to connect to SMTP server but failed while trying to send an email.

You can also send test mails via the plugin, this was successful.

In the form settings, I made sure that the specified sender matches the URL, as this can also cause problems.

If you need more information, please let me know. The website is up to date and uses PHP 8.0 .

Sidefact: I have had similar problems with sending emails with other customers. Have there been any new features that cause problems?

Thanks! Monique

The page I need help with: [log in to see the link]

 

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