Thanks for getting back to us, Shaindel.
The option to sort your customer's list by their last purchase isn't available. Rest assured, I'll take note of this idea and share it with our developers.
In case you want to create a mailing list using the Customer Contact List report, you can check this article for more information: How to create a mailing list using the Contact List report.
I'll be around to help you. Take care!
