Email sending from paid or free web domain.

Question

I am not sure but may be it possible, Can we send email through our paid/free domain through c#? If our domain is paid & if our site name is www.example.com
then can we send email through it & our email address should be [email protected]

Can we build it?If possible please share it.

Any type of advice are welcome!
I got this idea to see [email protected]

Thank you!