Cool, Glad to see this as a service. I did basically the same thing, but to send the pdf, glad to see that you converted the pdf to mobi, the reading experience is better!

I use a tool Denoflow [0] I developed to this thing, this is my workflow file [1].

[0]: https://github.com/denoflow/denoflow

[1]: https://github.com/theowenyoung/personal-flow/blob/main/work...