Getting rejected by a computer

Some time ago, I’ve applied for a middle management position in a big multinational company. The job opening specified that I need to put some specific keywords in the email subject, so I put those words, I got an immediate automatic reply back and then I wait.

A couple of days ago I got a standard thank you email from that company, a thank you that sounded computer generated

Now I wonder if a human actually saw my resume, or a computer considered I did not have the necessary qualities to be a part of that company