It’s been a while since I wrote an open-source contribution. A while back, a mini-project as I was involved required parsing of Sendgrid Webhooks in C#. As it turned out, there wasn’t much around and Sendgrid didn’t have an official library. Although at the time I pretty much stopped writing any C#, it was a good opportunity for an open source project.
Over the years, I’ve used several providers and techniques to send out email. I used IIS, AWS and few key email providers. And out of them all, I’ve been most happy with Sendgrid - and no, they are not paying me to say that.
The bottom line is, the more email you send, the more you want to rely on a 3rd party to take that burden from your hands.