For now it's using my email server, but i am open to add a smtp email integration to send it via user's service , i was conflicted which one should i integrate and just solved my problem for now and thought of thinking at scale later when i actually make it public .
There are just too many things for the same thing eg for email there's - mailchimp, resend, loops , ofc a simple smtp server
Thank you for your answer, i Love the Idea ans give IT a try for my new Project.