Reply once to every email from different address

I got a lot of email addresses from my customers and i want to reply to each and everyone of them once automatically. The problem is that i got over 30 company emails that customers sending emails too.
What is the best way to do this?

I'm looking for something like:
1. Add list of mails & passwords
2. scan all emails
3. reply once to each email

I've tried in the past blackhatautoresponder but it could only access pop with no yahoo support.

Any one knows a simpler solution?