I tried applying for the API access three times since October. Today I received this

[leo]

This is the mail system at host mx.merchantcircle.com.

I'm sorry to have to inform you that your message could not be
delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your
own text from the attached returned message.

The mail system

<gr...@center.merchantcircle.com> (expanded from
<a...@merchantcircle.com>):
unknown user: "greg"