Hello,
I have identified the issue with the assistance of ons of the module developer:
- This is not a standard Dolibarr module. Therefore, if you are looking for a module to send emails with the invoice attached as a PDF after it is automatically generated, you can use this module: GitHub - bugness-chl/sendrecurringinvoicebymail: Dolibarr module to send recurring invoice by email All the steps are detailed there.
- My problem was related to the configuration of my SMTP server. I am unsure why the emails were coming out correctly in HTML mode but not in plain text mode. I reconfigured the correct settings, and since then, the module has been functioning properly again.
I hope this information proves helpful to you.
Please do not hesitate to reach out if you have any questions regarding usage.
Regards