Such a plugin would need to be compatible with your e-commerce plugin. I recommend asking in that plugin’s dedicated support channel for suggestions. Not knowing what plugin that is, I can only speculate. I’d expect it to already send some sort of confirmation, so to meet your needs a plugin would probably want to filter the message content to deliver different messages based on order quantity.
In case you cannot find any plugin to meet your needs, it could be custom coded. Ideally there’d be a filter specifically for order confirmation messages. If not, one could use the generic “wp_mail” filter, provided the order data can somehow be within scope of the filter callback.
Thank you for your resposne! i’m using the woocommerce plug in, but using that i’m only able to send the same email to every customer who ist buying something. i discovered other plugins, with them i would be able to customize the email based on product category ect. but never based on dthe nuber of the ordered pieces.
I’m pretty sure WooCommerce emails are filterable with custom coding, so such code could send a different message than the default based on order quantities or any other criteria. The support staff at the dedicated WooCommerce support forum could advise on the filter name to use, but unless someone is very generous, you’re probably on your own for the coding.
If custom coding is not one of your skills, you can hire expert help through resources like https://jobs.wordpress.net/ or https://jetpack.pro/
