Tips for sending weekly automated emails

Based on my research looks like Sendgrid is perfect for this usecase.

We're using Drip for mail campaigns, and SendGrid for transactional e-mail directly send from our SaaS application (e.g., password resets, transaction confirmations, etc.).

SendGrid is free for low volume, take a look here for NodeJs integration: https://github.com/sendgrid/sendgrid-nodejs

Basically, it's a few lines of code to send an e-mail.

I use SendGrid. It has a very generous free plan and a $10 / mo plan which gives you everything you would need for an indie project.

I will say that Sendgrid is best suited if you want a lot of programatic control over what goes in the email. Sendgrid also supports webhooks and an inbound email parsing API which I've recently started using; it all works like a charm. But one needs to be more hands on compared to say... Mailchimp. If you want this fine-grain control, Sendgrid is great.

In the rare case I have had some technical issues, their support team has been very helpful and prompt, even working weekends.

For marketing emails, I like to use Drip and I've also heard great things about ConvertKit.

Based on your question though, it sounds like you're looking for something similar to SendGrid.

Can you give a little more information on what these emails will be? Are they going to be automatically generated from content within your app or something like that?