I have just begun working with an account that had been set up by someone else using Auth0 and Sendgrid to handle email verification.
Ever since the 11th of December, the whole thing just stopped sending emails out of the blue. We thought it had to do with payment plan but even after the upgrade it didn't change anything.
But here's the weird part: When we send a test email the whole thing works perfectly, but when we try to re-send authentication email it doesn't.
Does anyone have any clue as to what might be going on? We've checked settings and price plan and neither are any different to other accounts with the same set-up, yet it hasn't been working since the 11th.