Print Receivables Transactions Not Sending Emails to Customers

Summary:

I have set up the customer with the necessary contact details, including the email address, and assigned the responsibility as "Bill To." In the profile history, I have selected "Generate Bill" as "Yes" under the invoice section, and set the preferred delivery method to "E-Mail." In the Receivables system options, I also entered Transaction delivery by using email section, "From" and "To" email addresses, as well as the email subject and body.

After submitting the process, the email delivery process runs and ends with a success status. However, no emails are actually being sent to the customers.

What additional steps or configurations might be required to ensure that the emails are delivered to customers?