I didn't receive a rejection e-mail after I signed up for Amex Promo. I signed up Delta promo in the morning and Amex Rewards promo in the afternoon. I got both emails, such as the following:

Here's the information you requested

Dear XXX,

Thank you for contacting Fidelity Investments. For quick access to the information you requested, simply click on the links featured below.

The Fidelity AccountR
Trade. Invest. Manage. One account for your financial goals.

I ignored both e-mails. I'll check to see if Delta miles and Amex MR posted to my accounts on Sunday.