Ask HN: Best option for transactional emails for SaaS

I'm running an SAAS in an MVP stage and maintain an open source template to spin up a backend for SAAS apps.

I wonder what you think is a good to way to easily integrate transactional emails when you don't have much time, and are on a budget. The use cases would be both my own SAAS, and what to recommend in the course I'm planning to prepare for my backend template.

I did put effort into setting up a google workspace, making it work with my custom domain, and making sure that DKIM, DMARC, SPF are correctly configured. With that, I just generated an app-specific password, and ended up using my email to send transactional emails via SMTP. I know that there's solutions like loops.so, but they obviously use AWS SES, so I'd need to configure yet another email, and looking at their API, I'd need to do things like configure email templates in their console instead of just sending a free form email.

Is anyone aware of a good solution for SAASes that are just starting up?