Best tool to send responsive, dynamic analytics emails?

For a SaaS Analytics product it can make sense to send periodic nice-looking emails showing headline summaries and tables. I am surprised at the lack of low-effort solutions for this, but maybe I am not doing the right google search. This world seems to have its own terminology, like transactional/marketing, etc. Hence this Ask HN.

Key requirements:

- look good on mobile (i.e. responsive)

- dynamic content, i.e. templatized, with variables

- need to include tabular data with say 5 rows and 3-4 columns

- look good with nice designs

- Unsubscribe option

- Mostly doable in Python

We are looking at SendGrid, but I am not impressed with how the emails turn out, especially with tabular data. Mailchimp could be an option, but haven't gone down that path.

Thank you.