Customer Purchase Receipts Not Being Emailed

I am having the issue that when an item is purchased, the purchaser does not receive an emailed receipt. I have confirmed that emails, in general, are able to be sent out of WordPress and have installed Post SMTP to log the emails being sent. When a purchase is made, the admin receives their notification of the purchase but the purchaser DOES NOT. This is both confirmed in the received email accounts (email is received for admin and not received for purchaser) as well as in the Post SMTP log (a line item captures that the admin is sent an email and there is no line item showing emails sent from the site to the purchasers). There aren’t many options for the purchaser email template: the from Email Address (SAME as the admin email from address), Sender Name, and Message Body. Any suggestions are appreciated.