Apparently he's no longer the president of Nigeria. http://antifraudintl.org/threads/gen-muhammadu-buhari-nigerian-president.98320/ 
Return-Path: <genmuhbuhnigpresid1941@gmail.com>
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From: "Rtd. Gen. Muhammadu Bugari" <genmuhbuhnigpresid1941@gmail.com>
Date: Thu, 11 Oct 2018
Subject: If you are owed $35.5 million dollars by Nigeria Government then reconfirm your details to verify if you are the real beneficiary.
Dear Beneficiary,
This is to inform you that your name has been included among the 10 foreign beneficiaries that will receive their overdue $35.5 million dollars contract / inheritance claim from Nigeria Government this quarter ok. We are aware that you are one of several foreign beneficiaries that has been deceived and cheated by so many Nigerian criminals and impostors but advise you to work with me if you want to receive your $35.5 million now.
In view of this development, you are directed to reconfirm your name, address and phone number to me now so I can verify if you are the real beneficiary of the fund to avoid any misrepresentation of claims ok. Thanks and goodluck while expecting to hear from you asap and if I do not hear from you soonest then it means that your claim is fictitious and non-existed and would be treated accordingly ok.
Rtd. Gen. Muhammadu Buhari (GCFR)
Former Head of State & President of Nigeria.
Return-Path: <genmuhbuhnigpresid1941@gmail.com>
Received: from (EHLO mail-wr1-f68.google.com) (209.85.221.68)
Reply-To: genmuhbuh.nigpresid@gmail.com
From: "Rtd. Gen. Muhammadu Bugari" <genmuhbuhnigpresid1941@gmail.com>
Date: Thu, 11 Oct 2018
Subject: If you are owed $35.5 million dollars by Nigeria Government then reconfirm your details to verify if you are the real beneficiary.
Dear Beneficiary,
This is to inform you that your name has been included among the 10 foreign beneficiaries that will receive their overdue $35.5 million dollars contract / inheritance claim from Nigeria Government this quarter ok. We are aware that you are one of several foreign beneficiaries that has been deceived and cheated by so many Nigerian criminals and impostors but advise you to work with me if you want to receive your $35.5 million now.
In view of this development, you are directed to reconfirm your name, address and phone number to me now so I can verify if you are the real beneficiary of the fund to avoid any misrepresentation of claims ok. Thanks and goodluck while expecting to hear from you asap and if I do not hear from you soonest then it means that your claim is fictitious and non-existed and would be treated accordingly ok.
Rtd. Gen. Muhammadu Buhari (GCFR)
Former Head of State & President of Nigeria.