by default, wppizza sends plaintext emails.

if you wish to send html emails, go to wppizza->settings and change “Select Type of Mail Delivery” to “HTML and plaintext”

if you do , you probably want to edit the html template. To do so, move “wppizza-order-html-email.php” from the wppizza template directory to your theme folder and edit as required

if you want to use smtp, do the same with “wppizza-phpmailer-settings.php” and edit as needed or use one of the freely available smtp sending plugins available on wordpress