Is it acceptable to deny someone when they meet all applicable job requirements?

I applied for a position with a company based where I live. Within their job description they listed approximately 8 required and preferred qualifications. I have all of the applicable required and preferred attributes that they are looking for, yet I was declined (4 hours later) for the position via an automated response from the recruiter. I am questioning if this is an acceptable practice to not. The only piece I can think that I did not qualify for is the minimum salary. They did not ask if a specific range is acceptable, but only asked for a minimal acceptable salary(a blank free form field) and it was a required field on their career webpage. Any help on this matter is appreciated.