Trouble sending password reset emails

I tried the instructions in the video, but I couldn't get it to work with my Gmail (and it wasn't clear if the problem was with the security settings on Google's end or a problem with the code). I tried a Zoho account as well but couldn't get it to work. Then I tried setting it up through SendGrid. They have an SMTP option and an API option. I couldn't get the SMTP option to work at all. I got the API to work with a test file, but it's failing to authenticate when I tried integrating into the product. HTTP Error 401: Unauthorized This feature is tangential to the MVP, though, so at this point I think I should just move on, despite knowing that bugs should be fixed first before new features.