Email Marketing Campaign Tracking Tool - Need Help

I want to build a micro SAAS using Bubble where user can enter their favorite competitor’s website name and we give them a unique email address to sign up for their newsletter, lead form, etc.

Once signed up, they can view all the emails from the brands inside our Bubble app.

I am not able to figure out which service/tool I can use to give them a unique email address and display received emails inside my Bubble app.

Can anyone please help me out?