I replied to a similar posting but for a different Job and industry. Its leaves me suspicious.

I think any legitimate employer would respond with a relay e-mail address.

I also did not find the terms of employment fair.  Committing to a position with on clear basis for travel reimbursement feels uncomfortable. Why are they reluctant to just say & .50/ a mile?

I declined further contact.

I applied for a job, received an email response:
 and haven't yet called the number from the job application email I received; but, it seems legit for part time work.  I don't think it is a debt collection.  :)

copied/pasted partially from the email:
Hello,

After reviewing your application we would like the opportunity to interview you for the Insurance Inspector position. Please read through the following job details and follow the directions below.

Overview:

Mueller Services, headquartered in Buffalo, NY, is a nationwide provider of insurance data related services. These services include the collection of both residential and commercial insurance data. Mueller is recognized by the top insurance carriers for providing customers with industry leading quality, customer service, and technology. We take pride in recruiting and training motivated individuals for either a full or part time career in the insurance industry.

debt collector