irisvanheusden

Thanks for the help.

fot future reference, it turned to be a conflict with WooCommerce payments which was active but not actually configured. Possibly it clashed with Mollie payments?

Thanks for the reply. I can not identify any plug-in that sends emails. Here is the list of active plugins.

ATUM Inventory Management for WooCommerce

Beautiful and responsive cookie consent

Duplicate Posts, Pages and Custom Posts using single click.

Elementor          

Elementor Pro  

Mollie Payments for WooCommerce

Mollie settings | Logs | Deactivate

PostNL for WooCommerce

Rank Math SEO

Related Products for WooCommerce

Site Kit by Google

UpdraftPlus - Backup/Restore

WooCommerce

WooCommerce Payments

WooCommerce PDF Invoices, Packing Slips, Delivery Notes and Shipping Labels

WP Mail Logging

WP Mail SMTP