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How can I tell whether a mathematics journal seems reputable?

I received the following email from the "American Journal of Pure and Applied Mathematics" after submitting a paper online. How can I tell whether this is a reputable journal? In general, how can I tell whether a mathematics journal is reputable?

Dear Authors,

On behalf of the Chief Editor of the “American Journal of Pure and Applied Mathematics” we are happy to inform you that your article entitled ‘A possible approach proof to proof the Riemann Hypothesis” is accepted for publication in (Jan-June 2015).

Please send DD/Cheque for US $ 250.00 payable to ‘ Vijay Kumar Jha ‘ to our address.

Our address: Vijay Kumar Jha Managing Editor c\o. ACADEMIC RESEARCH JOURNALS (INDIA)

4383/4A, Ansari Road, Darya Ganj, New Delhi-110002

(M) 08826561892

We thank you very much for your contribution and encourage you to continue submitting your future.

Yours sincerely,