Why do I keep getting emails like these?

FROM : REV FR PHILLIPS MATHEWSDIRECTOR INTERNATIONAL REMITTANCE DEPARTMENTCENTRAL BANK OF NIGERIA(CBN) DEAR BENEFICIARY, VERIFICATION OF YOUR PAYMENT/WINNINGS FILE. THIS IS TO INFORM YOU THAT FROM THE RECORDS OF OUTSTANDING PAYMENT WITH THE FEDERAL GOVERNMENT , YOUR NAME WAS DISCOVERED AS NEXT ON THE LIST OF OUTSTANDING PAYMENTS WHO HAVE NOT YET RECEIVED THEIR PAYMENT. I WISH TO INFORM YOU THAT YOUR PAYMENT IS BEING PROCESSED AND WILL BE RELEASED TO YOU AS SOON AS YOU RESPOND TO THIS LETTER. ALSO NOTE THAT FROM THE RECORD IN MY FILE YOUR OUTSTANDING PART PAYMENT OF US$1,700,000.00 (ONE MILLION SEVEN HUNDRED THOUSAND UNITED STATES DOLLARS) IS READY FOR PAYMENT. KINDLY RE-CONFIRM TO ME THE FOLLOWING: 1) YOUR FULL NAME. ........................................… YOUR CONTACT ADDRESS .................................3) YOUR FULL BANKING DATA................................4) PHONE, AND MOBILE #. ................................5) PRIVATE EMAIL ADDRESS ....................................6) MARITAL STATUS ...........................7) AGE ...................................AS SOON AS THE ABOVE INFORMATION IS RECEIVED, YOUR PAYMENT WILL BE MADE TO YOU IN A CERTIFIED BANK DRAFT OR WIRE TRANSFER TO YOUR NOMINATED BANK ACCOUNT ANY ONE OF YOUR CHOICE .YOU CONTACT ME AS SOON AS YOU RECEIVE THIS MEMO FOR MORE DETAILS