diff --git a/apps/site/src/lib/auth.ts b/apps/site/src/lib/auth.ts
index f9f7bf78..80c112c1 100644
--- a/apps/site/src/lib/auth.ts
+++ b/apps/site/src/lib/auth.ts
@@ -2,7 +2,7 @@ import { env } from "cloudflare:workers";
 import { mcp } from "@better-auth/mcp";
 import { betterAuth } from "better-auth";
 import { emailOTP, jwt, magicLink } from "better-auth/plugins";
-import { sendCodingCatEmail } from "@/lib/email";
+import { sendCodingCatAuthEmail } from "@/lib/email";
 
 export const BETTER_AUTH_SECRET =
 	(env as unknown as { BETTER_AUTH_SECRET?: string })?.BETTER_AUTH_SECRET ||
@@ -211,7 +211,7 @@ function buildPortalAuthPlugins() {
 					</div>
 				`;
 
-				await sendCodingCatEmail({
+				await sendCodingCatAuthEmail({
 					to: email,
 					subject,
 					text,
@@ -260,7 +260,7 @@ function buildPortalAuthPlugins() {
 					</div>
 				`;
 
-				await sendCodingCatEmail({
+				await sendCodingCatAuthEmail({
 					to: email,
 					subject,
 					text,
diff --git a/apps/site/src/lib/email.ts b/apps/site/src/lib/email.ts
index 7b08e6b3..d4be69c8 100644
--- a/apps/site/src/lib/email.ts
+++ b/apps/site/src/lib/email.ts
@@ -424,6 +424,37 @@ export async function sendCodingCatEmailDetailed(
 	};
 }
 
+/**
+ * Sign-in codes and magic links are the one exception to the disabled
+ * automated sending above: nobody can sign in without them. They go through
+ * Cloudflare Email Sending, which requires `from` on the onboarded
+ * codingcat.dev domain.
+ */
+export async function sendCodingCatAuthEmail(opts: {
+	to: string;
+	subject: string;
+	text: string;
+	html: string;
+}): Promise<void> {
+	const workerEnv = (env ?? {}) as unknown as { EMAIL?: SendEmailBinding };
+	if (!workerEnv.EMAIL) {
+		throw new Error("EMAIL binding is not configured");
+	}
+	try {
+		await workerEnv.EMAIL.send({
+			to: opts.to,
+			from: { email: "noreply@codingcat.dev", name: "CodingCat.dev" },
+			subject: opts.subject,
+			text: opts.text,
+			html: opts.html,
+		});
+	} catch (error) {
+		const code = (error as { code?: string })?.code ?? "unknown";
+		console.error(`Sign-in email failed: ${code}`);
+		throw error;
+	}
+}
+
 export async function sendCodingCatEmail(
 	opts: CodingCatEmailOptions,
 ): Promise<boolean> {
diff --git a/apps/site/src/lib/google-calendar.ts b/apps/site/src/lib/google-calendar.ts
index 31f15447..b21cec35 100644
--- a/apps/site/src/lib/google-calendar.ts
+++ b/apps/site/src/lib/google-calendar.ts
@@ -39,9 +39,7 @@ async function syncPrivateShadowCalendarBlocks(opts: {
 			"Private Calendar Block synced from alex@codingcat.dev",
 			`Room: ${studioOrMeet}`,
 			`Guest: ${opts.guestName} (${opts.company})`,
-			...(opts.portalUrl
-				? [`Guest Studio Portal: ${opts.portalUrl}`]
-				: []),
+			...(opts.portalUrl ? [`Guest Studio Portal: ${opts.portalUrl}`] : []),
 		].join("\n"),
 		location: studioOrMeet,
 		status: "confirmed",
diff --git a/apps/site/src/pages/api/portal/notes.ts b/apps/site/src/pages/api/portal/notes.ts
index d02e2ea9..cf543b30 100644
--- a/apps/site/src/pages/api/portal/notes.ts
+++ b/apps/site/src/pages/api/portal/notes.ts
@@ -851,7 +851,7 @@ export const POST: APIRoute = async ({ request, url }) => {
 					headline:
 						chatMessage && noteType === "call_note"
 							? `Call Notes & Next Steps for ${company} x CodingCat.dev`
-							: `Alex Patterson Updated Your Shared Run-of-Show & Notes`,
+							: "Alex Patterson Updated Your Shared Run-of-Show & Notes",
 					introParagraph: chatMessage
 						? `I just posted new notes${newAttachments.length > 0 ? " and shared files" : ""} in your CodingCat.dev Studio Portal: "${chatMessage.slice(0, 280)}${chatMessage.length > 280 ? "..." : ""}". You can reply, drop files into the chat, or edit the shared Run-of-Show directly in your portal below.`
 						: "I just updated our shared Pre-Call Notes and 5-Part Run-of-Show outline in your CodingCat.dev Studio Portal. Take a look below and feel free to edit or leave a comment directly in the portal!",
@@ -913,7 +913,7 @@ export const POST: APIRoute = async ({ request, url }) => {
 							? `${resolvedAuthorName} Posted a Note in the Studio Portal`
 							: `${resolvedAuthorName} Updated the Shared Run-of-Show`,
 					introParagraph: isFeedback
-						? `${resolvedAuthorName} (${verifiedEmail || guestEmail}) just submitted feedback on the CodingCat.dev Booking & Studio Portal${feedbackRating ? ` (Rating: ${feedbackRating}/5)` : ""}${feedbackTopics.length > 0 ? ` [${feedbackTopics.join(", ")}]` : ""}${newAttachments.length > 0 ? ` with an annotated screen capture synced to Sanity Media Library` : ""}.`
+						? `${resolvedAuthorName} (${verifiedEmail || guestEmail}) just submitted feedback on the CodingCat.dev Booking & Studio Portal${feedbackRating ? ` (Rating: ${feedbackRating}/5)` : ""}${feedbackTopics.length > 0 ? ` [${feedbackTopics.join(", ")}]` : ""}${newAttachments.length > 0 ? " with an annotated screen capture synced to Sanity Media Library" : ""}.`
 						: chatMessage
 							? `${resolvedAuthorName} (${verifiedEmail || guestEmail}) just posted a message${newAttachments.length > 0 ? ` and dropped ${newAttachments.length} attachment(s)` : ""} in the ${company} Studio Portal: "${chatMessage}".`
 							: `${resolvedAuthorName} (${verifiedEmail || guestEmail}) just edited the shared Run-of-Show / Pre-Call Notes in the ${company} Studio Portal.`,