Sendgrid returns 202 but doesn't send email

Question

I\'m trying to get the basic \"hello world\" of sendgrid working, but have so far been unsuccessful. The response returns code 202, suggesting that it will send the email,

Answer 1

Debug this by going to the sendgrid api log here: https://app.sendgrid.com/email_activity

In my case, it was a DMARC receiving domain block.