[sudonim]

My guess is that the OPs email address soft-bounced 3 times and was added to Uber's suppression list within their sendgrid account (they are a sendgrid customer).

There's probably no way for Uber support to see what's happening in their sendgrid account and this was probably failing silently. Uber's app was attempting to send the password reset email, but your email was on the suppression list and delivery was stopped before it was attempted.

[apinstein]

This is probably accurate. We had a similar situation occur frequently on our platform and fortunately Mandrill has awesome built-in support for ensuring your support team never does this to anyone. Read the article here: http://blog.mandrill.com/email-as-a-service-as-a-service.htm...

[arielm]

This is most likely the case. We're using Mandrill and while rare, real emails sometimes bounce and get into the blacklist. Out technical support team has access though, so those issues get resolved within our standard response window (< an hour).

[camel_gopher]

I had this exact same issue, and I was using a gmail address. This occurred multiple times for me.