Initial

web/js/src/discardAllMail.js

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+// "Discard all mail" checkbox behavior on Add/Edit Mail Account pages
+export default function handleDiscardAllMail() {
+	const discardAllMailCheckbox = document.querySelector('.js-discard-all-mail');
+
+	if (!discardAllMailCheckbox) {
+		return;
+	}
+
+	discardAllMailCheckbox.addEventListener('click', () => {
+		const forwardToTextarea = document.querySelector('.js-forward-to-textarea');
+		const doNotStoreCheckbox = document.querySelector('.js-do-not-store-checkbox');
+
+		if (discardAllMailCheckbox.checked) {
+			// Disable "Forward to" textarea
+			forwardToTextarea.disabled = true;
+
+			// Check "Do not store forwarded mail" checkbox
+			doNotStoreCheckbox.checked = true;
+
+			// Hide "Do not store forwarded mail" checkbox container
+			doNotStoreCheckbox.parentElement.classList.add('u-hidden');
+		} else {
+			// Enable "Forward to" textarea
+			forwardToTextarea.disabled = false;
+
+			// Show "Do not store forwarded mail" checkbox container
+			doNotStoreCheckbox.parentElement.classList.remove('u-hidden');
+		}
+	});
+}