Create a scam-baiting response to the most recent email, to keep the scammer in a false sense of security. Use the prior emails as a point of reference.

Email #1, from Mark Williams:

Greetings from Agent Mark John Williams,Un Diplomatic Agent,.
I,m currently at Washington DC waiting for the completion of your delivery' I was sent to complete your ATM CARD delivery by UN Representatives and I will like you to fellow all my direction to enable us to achieve the good aim and get your FUND ATM CARD to you through any of your choice.

Remember this transaction is free risky and you dont have to worry about anything,only simple fellow the instruction and you must rejoice. Firstly you have to give me benefits of doubts to see the end of this delivery as matter of urgency because I have limit time here. Kindly reconfirm your information and in accordance to the United States shipping policy,rules and regulations on operational delivery on Domestic and International delivery of such a confidential Item just like yours as par stated; be informed that you are advised of this very need for you to INCUR NATIONAL INSURANCE FEE of $100 dollar only and you will receive your ATM card without any delaying or additional charges ok.
Buy steam wallet gift card or Sephora gift card or Razor gold card or Google play card and attach the copy here and you will receive your ATM card immediately after the payment without any more delaying or asking you for additional charges ok
I will be waiting.

So therefore kindly update me once you receive this message.
Kind regards Agent <PRESIDIO_ANONYMIZED_PERSON>

Email #2, from Cameron McCaffrey (me):

 Dear Agent <PRESIDIO_ANONYMIZED_PERSON>,

Thank you for reaching out with such astounding news! I must express, your message has ignited a surge of excitement in me. It isn’t every day one receives communication from a distinguished UN Diplomatic Agent.

I am more than prepared to follow your instructions to the letter. The prospect of having the ATM CARD in my possession fills me with anticipation, and I commend you for handling such an important mission.

Nonetheless, before we proceed with the fulfillment of the fee, for my own documentation and due diligence, I would be grateful to receive a brief outline of the delivery process. Also, a bit of official confirmation would be reassuring. Could you, for instance, provide me with a tracking number for the ATM card delivery, or perhaps some form of identification from your end? I hope you perceive my request as a routine procedure, ensuring that we are both safely guarded against any miscommunications.

Once I have that, rest assured, I will promptly attend to the national insurance fee. Securing the funds has never been an issue, and I am glad to support the cost to further the justified conclusion of this benefit. While I am not overly familiar with purchasing the types of gift cards you’ve mentioned, I will make inquiries on how to acquire them first thing tomorrow morning.

Lastly, may I suggest an emergency point of contact? Given the limited time you have in Washington DC, it would be wise to establish a more direct line of communication — perhaps a secure phone number? This would enable us to iron out any unforeseen hindrances posthaste.

Please update me at your earliest convenience.

Warmest regards,

Cameron McCaffrey
cmccaff1@fau.edu

Email #3, from Mark:

Attention Cameron McCaffrey.
Your message is well noted and I must tell you that everything will be order the control immediately you send the $100 charges through any of these gift card I mentioned on my precious message.
Meanwhile there is nothing I can do until I receive the fees because I have other delivery that I have at hand and immediately you send the $100, I will send you my flight schedule along with the copy of your ATM card and insurance certificate.i hope you can simple understand my messages and act accordingly.
I will be waiting for your update with the copy of the gift card. Agent Mark J Williams....