Question about transactional email settings and Sendgrid


I am getting ready to launch my app, but I am a bit confused in regards to setting up Sendgrid for transactional emails. I have not linked a Sendgrid account to bubble and currently my transactional emails are sent from [email protected]

Is it possible to launch like this? Is Sendgrid only needed in order to have the email sent from my own custom domain email?

I keep reading the horror stories people have had with Sendgrid and I’m wondering what the best step forward is. Any advice/experience is appreciated.

Thank you!