Very cool! I signed up. I was wondering if you did some research before picking sendgrid. I see their free tier has a limit of 100 emails a day after the first month. Their 100K/month is $15/month which is not bad I guess.
Yeah, I've done some research and decided to go with Sendgrid because they are the only ones that offer API in their free tier. Their free marketing campaign plan offers 2k contacts + 6k emails month which should be plenty to start.