find vendor/magento/. -name 'email_templates.xml' -exec grep -i 'template id=' {} \; > email_templates.list.txt

template-list.xml

<template id="checkout_payment_failed_template" label="Payment Failed" file="failed_payment.html" type="html" module="Magento_Checkout" area="adminhtml"/>
<template id="contact_email_email_template" label="Contact Form" file="submitted_form.html" type="text" module="Magento_Contact" area="adminhtml"/>
<template id="customer_create_account_email_template" label="New Account" file="account_new.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_create_account_email_no_password_template" label="New Account Without Password" file="account_new_no_password.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_create_account_email_confirmation_template" label="New Account Confirmation Key" file="account_new_confirmation.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_create_account_email_confirmed_template" label="New Account Confirmed" file="account_new_confirmed.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_password_forgot_email_template" label="Forgot Password" file="password_reset_confirmation.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_password_remind_email_template" label="Remind Password" file="password_new.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_password_reset_password_template" label="Reset Password" file="password_reset.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_account_information_change_email_template" label="Change Email" file="change_email.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_account_information_change_email_and_password_template" label="Change Email and Password" file="change_email_and_password.html" type="html" module="Magento_Customer" area="frontend"/>
<template id="customer_magento_customerbalance_email_template" label="Store Credit Update" file="update_notification.html" type="html" module="Magento_CustomerBalance" area="frontend"/>
<template id="currency_import_error_email_template" label="Currency Update Warnings" file="currency_update_notification.html" type="text" module="Magento_Directory" area="adminhtml"/>
<template id="design_email_header_template" label="Header" file="header.html" type="html" module="Magento_Email" area="frontend"/>
<template id="design_email_footer_template" label="Footer" file="footer.html" type="html" module="Magento_Email" area="frontend"/>
<template id="giftcard_email_template" label="Gift Card(s) Purchase" file="gift_information.html" type="html" module="Magento_GiftCard" area="frontend"/>
<template id="giftcard_giftcardaccount_email_template" label="Gift Card Code/Balance" file="card_information.html" type="html" module="Magento_GiftCardAccount" area="frontend"/>
<template id="magento_giftregistry_owner_email_template" label="New Registry" file="owner.html" type="html" module="Magento_GiftRegistry" area="frontend"/>
<template id="magento_giftregistry_sharing_email_template" label="Registry Sharing" file="sharing.html" type="html" module="Magento_GiftRegistry" area="frontend"/>
<template id="magento_giftregistry_update_email_template" label="Registry Update" file="update.html" type="html" module="Magento_GiftRegistry" area="frontend"/>
<template id="magento_invitation_email_template" label="Customer Invitation" file="invitation.html" type="html" module="Magento_Invitation" area="frontend"/>
<template id="newsletter_subscription_confirm_email_template" label="Subscription Confirmation" file="subscr_confirm.html" type="html" module="Magento_Newsletter" area="frontend"/>
<template id="newsletter_subscription_success_email_template" label="Subscription Success" file="subscr_success.html" type="html" module="Magento_Newsletter" area="frontend"/>
<template id="newsletter_subscription_un_email_template" label="Unsubscription Success" file="unsub_success.html" type="html" module="Magento_Newsletter" area="frontend"/>
<template id="catalog_productalert_email_stock_template" label="Stock Alert" file="stock_alert.html" type="html" module="Magento_ProductAlert" area="frontend"/>
<template id="catalog_productalert_email_price_template" label="Price Alert" file="price_alert.html" type="html" module="Magento_ProductAlert" area="frontend"/>
<template id="catalog_productalert_cron_error_email_template" label="Cron Error Warning" file="cron_error.html" type="text" module="Magento_ProductAlert" area="adminhtml"/>
<template id="magento_reminder_email_template" label="Promotion Notification/Reminder" file="promotion.html" type="html" module="Magento_Reminder" area="frontend"/>
<template id="magento_reward_notification_balance_update_template" label="Balance Update" file="balance_update.html" type="html" module="Magento_Reward" area="frontend"/>
<template id="magento_reward_notification_expiry_warning_template" label="Points Expiry Warning" file="expiry_warning.html" type="html" module="Magento_Reward" area="frontend"/>
<template id="sales_email_magento_rma_template" label="New RMA" file="new.html" type="html" module="Magento_Rma" area="frontend"/>
<template id="sales_email_magento_rma_guest_template" label="New RMA for Guest" file="new_guest.html" type="html" module="Magento_Rma" area="frontend"/>
<template id="sales_email_magento_rma_auth_template" label="RMA Authorization" file="auth.html" type="html" module="Magento_Rma" area="frontend"/>
<template id="sales_email_magento_rma_auth_guest_template" label="RMA Authorization for Guest" file="auth_guest.html" type="html" module="Magento_Rma" area="frontend"/>
<template id="sales_email_magento_rma_comment_template" label="RMA Admin Comments" file="comment.html" type="html" module="Magento_Rma" area="frontend"/>
<template id="sales_email_magento_rma_comment_guest_template" label="RMA Admin Comments for Guest" file="comment_guest.html" type="html" module="Magento_Rma" area="frontend"/>
<template id="sales_email_magento_rma_customer_comment_template" label="RMA Customer Comments" file="customer_comment.html" type="html" module="Magento_Rma" area="adminhtml"/>
<template id="sales_email_order_template" label="New Order" file="order_new.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_order_guest_template" label="New Order for Guest" file="order_new_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_order_comment_template" label="Order Update" file="order_update.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_order_comment_guest_template" label="Order Update for Guest" file="order_update_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_invoice_template" label="New Invoice" file="invoice_new.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_invoice_guest_template" label="New Invoice for Guest" file="invoice_new_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_invoice_comment_template" label="Invoice Update" file="invoice_update.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_invoice_comment_guest_template" label="Invoice Update for Guest" file="invoice_update_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_creditmemo_template" label="New Credit Memo" file="creditmemo_new.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_creditmemo_guest_template" label="New Credit Memo for Guest" file="creditmemo_new_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_creditmemo_comment_template" label="Credit Memo Update" file="creditmemo_update.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_creditmemo_comment_guest_template" label="Credit Memo Update for Guest" file="creditmemo_update_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_shipment_template" label="New Shipment" file="shipment_new.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_shipment_guest_template" label="New Shipment for Guest" file="shipment_new_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_shipment_comment_template" label="Shipment Update" file="shipment_update.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="sales_email_shipment_comment_guest_template" label="Shipment Update for Guest" file="shipment_update_guest.html" type="html" module="Magento_Sales" area="frontend"/>
<template id="magento_scheduledimportexport_import_failed" label="Import Failed" file="import_failed.html" type="html" module="Magento_ScheduledImportExport" area="adminhtml"/>
<template id="magento_scheduledimportexport_export_failed" label="Export Failed" file="export_failed.html" type="html" module="Magento_ScheduledImportExport" area="adminhtml"/>
<template id="system_magento_scheduled_import_export_log_error_email_template" label="File History Clean Failed" file="file_history_clean_failed.html" type="html" module="Magento_ScheduledImportExport" area="adminhtml"/>
<template id="sendfriend_email_template" label="Send Product Link to Friend" file="product_share.html" type="html" module="Magento_SendFriend" area="frontend"/>
<template id="sitemap_generate_error_email_template" label="Sitemap Generation Warnings" file="generate_warnings.html" type="text" module="Magento_Sitemap" area="adminhtml"/>
<template id="admin_emails_forgot_email_template" label="Forgot Admin Password" file="password_reset_confirmation.html" type="text" module="Magento_User" area="adminhtml"/>
<template id="admin_emails_user_notification_template" label="User Notification" file="user_notification.html" type="text" module="Magento_User" area="adminhtml"/>
<template id="wishlist_email_email_template" label="Wish List Sharing" file="share_notification.html" type="html" module="Magento_Wishlist" area="frontend"/>