diff --git a/app/api/accounts/emails/route.ts b/app/api/accounts/emails/route.ts
new file mode 100644
index 00000000..ba0927b9
--- /dev/null
+++ b/app/api/accounts/emails/route.ts
@@ -0,0 +1,36 @@
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { getCorsHeaders } from "@/lib/networking/getCorsHeaders";
+import { getAccountEmailsHandler } from "@/lib/accounts/getAccountEmailsHandler";
+
+/**
+ * OPTIONS handler for CORS preflight requests.
+ *
+ * @returns A NextResponse with CORS headers.
+ */
+export async function OPTIONS(): Promise<NextResponse> {
+  return new NextResponse(null, {
+    status: 200,
+    headers: getCorsHeaders(),
+  });
+}
+
+/**
+ * GET /api/accounts/emails
+ *
+ * Retrieves account email rows for the requested account IDs after verifying
+ * that the authenticated caller can access every requested account.
+ *
+ * Query parameters:
+ * - account_id (optional, repeatable): Account IDs to look up
+ *
+ * @param request - The incoming request with account query parameters.
+ * @returns A NextResponse with matching account email rows or an error response.
+ */
+export async function GET(request: NextRequest): Promise<NextResponse> {
+  return getAccountEmailsHandler(request);
+}
+
+export const dynamic = "force-dynamic";
+export const fetchCache = "force-no-store";
+export const revalidate = 0;
diff --git a/lib/accounts/__tests__/getAccountEmailsHandler.test.ts b/lib/accounts/__tests__/getAccountEmailsHandler.test.ts
new file mode 100644
index 00000000..5cfa871b
--- /dev/null
+++ b/lib/accounts/__tests__/getAccountEmailsHandler.test.ts
@@ -0,0 +1,106 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { getAccountEmailsHandler } from "../getAccountEmailsHandler";
+import { validateGetAccountEmailsQuery } from "../validateGetAccountEmailsQuery";
+import selectAccountEmails from "@/lib/supabase/account_emails/selectAccountEmails";
+
+vi.mock("@/lib/networking/getCorsHeaders", () => ({
+  getCorsHeaders: vi.fn(() => ({ "Access-Control-Allow-Origin": "*" })),
+}));
+
+vi.mock("../validateGetAccountEmailsQuery", () => ({
+  validateGetAccountEmailsQuery: vi.fn(),
+}));
+
+vi.mock("@/lib/supabase/account_emails/selectAccountEmails", () => ({
+  default: vi.fn(),
+}));
+
+function createMockRequest(): NextRequest {
+  return {
+    url: "http://localhost:3000/api/accounts/emails",
+    nextUrl: new URL("http://localhost:3000/api/accounts/emails"),
+    headers: new Headers({ authorization: "Bearer test-token" }),
+  } as unknown as NextRequest;
+}
+
+describe("getAccountEmailsHandler", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns validation response errors directly", async () => {
+    vi.mocked(validateGetAccountEmailsQuery).mockResolvedValue(
+      NextResponse.json({ status: "error", error: "Unauthorized" }, { status: 401 }),
+    );
+
+    const result = await getAccountEmailsHandler(createMockRequest());
+
+    expect(result.status).toBe(401);
+  });
+
+  it("returns validation errors for empty account ID input", async () => {
+    vi.mocked(validateGetAccountEmailsQuery).mockResolvedValue(
+      NextResponse.json(
+        {
+          status: "error",
+          missing_fields: ["account_id"],
+          error: "At least one account_id parameter is required",
+        },
+        { status: 400 },
+      ),
+    );
+
+    const result = await getAccountEmailsHandler(createMockRequest());
+
+    expect(result.status).toBe(400);
+  });
+
+  it("returns validation response errors directly for unauthorized accounts", async () => {
+    vi.mocked(validateGetAccountEmailsQuery).mockResolvedValue(
+      NextResponse.json({ error: "Unauthorized" }, { status: 403 }),
+    );
+
+    const result = await getAccountEmailsHandler(createMockRequest());
+
+    expect(result.status).toBe(403);
+    expect(selectAccountEmails).not.toHaveBeenCalled();
+  });
+
+  it("returns raw account email rows when all requested accounts are authorized", async () => {
+    const rows = [
+      {
+        id: "email-1",
+        account_id: "acc-1",
+        email: "owner@example.com",
+        updated_at: "2026-04-08T00:00:00.000Z",
+      },
+    ];
+
+    vi.mocked(validateGetAccountEmailsQuery).mockResolvedValue({
+      authenticatedAccountId: "account-123",
+      accountIds: ["acc-1", "acc-2"],
+    });
+    vi.mocked(selectAccountEmails).mockResolvedValue(rows);
+
+    const result = await getAccountEmailsHandler(createMockRequest());
+
+    expect(selectAccountEmails).toHaveBeenCalledWith({ accountIds: ["acc-1", "acc-2"] });
+    expect(result.status).toBe(200);
+    await expect(result.json()).resolves.toEqual(rows);
+  });
+
+  it("returns an empty array when account email lookup returns no rows", async () => {
+    vi.mocked(validateGetAccountEmailsQuery).mockResolvedValue({
+      authenticatedAccountId: "account-123",
+      accountIds: ["acc-1"],
+    });
+    vi.mocked(selectAccountEmails).mockResolvedValue([]);
+
+    const result = await getAccountEmailsHandler(createMockRequest());
+
+    expect(result.status).toBe(200);
+    await expect(result.json()).resolves.toEqual([]);
+  });
+});
diff --git a/lib/accounts/__tests__/validateGetAccountEmailsQuery.test.ts b/lib/accounts/__tests__/validateGetAccountEmailsQuery.test.ts
new file mode 100644
index 00000000..de832e75
--- /dev/null
+++ b/lib/accounts/__tests__/validateGetAccountEmailsQuery.test.ts
@@ -0,0 +1,115 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { validateGetAccountEmailsQuery } from "../validateGetAccountEmailsQuery";
+import { checkAccountAccess } from "@/lib/auth/checkAccountAccess";
+import { validateAuthContext } from "@/lib/auth/validateAuthContext";
+
+vi.mock("@/lib/networking/getCorsHeaders", () => ({
+  getCorsHeaders: vi.fn(() => ({ "Access-Control-Allow-Origin": "*" })),
+}));
+
+vi.mock("@/lib/auth/validateAuthContext", () => ({
+  validateAuthContext: vi.fn(),
+}));
+
+vi.mock("@/lib/auth/checkAccountAccess", () => ({
+  checkAccountAccess: vi.fn(),
+}));
+
+function createMockRequest(url: string): NextRequest {
+  return {
+    url,
+    nextUrl: new URL(url),
+    headers: new Headers({ authorization: "Bearer test-token" }),
+  } as unknown as NextRequest;
+}
+
+describe("validateGetAccountEmailsQuery", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns auth error when validateAuthContext fails", async () => {
+    vi.mocked(validateAuthContext).mockResolvedValue(
+      NextResponse.json({ status: "error", error: "Unauthorized" }, { status: 401 }),
+    );
+
+    const result = await validateGetAccountEmailsQuery(
+      createMockRequest("http://localhost:3000/api/accounts/emails?account_id=acc-1"),
+    );
+
+    expect(result).toBeInstanceOf(NextResponse);
+    expect(validateAuthContext).toHaveBeenCalledTimes(1);
+    if (result instanceof NextResponse) {
+      expect(result.status).toBe(401);
+    }
+  });
+
+  it("returns 400 when no account IDs are provided", async () => {
+    vi.mocked(validateAuthContext).mockResolvedValue({
+      accountId: "account-123",
+      orgId: null,
+      authToken: "token",
+    });
+
+    const result = await validateGetAccountEmailsQuery(
+      createMockRequest("http://localhost:3000/api/accounts/emails"),
+    );
+
+    expect(result).toBeInstanceOf(NextResponse);
+    if (result instanceof NextResponse) {
+      expect(result.status).toBe(400);
+      await expect(result.json()).resolves.toEqual({
+        status: "error",
+        missing_fields: ["account_id"],
+        error: "At least one account_id parameter is required",
+      });
+    }
+  });
+
+  it("returns parsed repeated account IDs", async () => {
+    vi.mocked(validateAuthContext).mockResolvedValue({
+      accountId: "account-123",
+      orgId: null,
+      authToken: "token",
+    });
+    vi.mocked(checkAccountAccess).mockResolvedValue({ hasAccess: true, entityType: "self" });
+
+    const result = await validateGetAccountEmailsQuery(
+      createMockRequest(
+        "http://localhost:3000/api/accounts/emails?account_id=acc-1&account_id=acc-2",
+      ),
+    );
+
+    expect(result).toEqual({
+      authenticatedAccountId: "account-123",
+      accountIds: ["acc-1", "acc-2"],
+    });
+  });
+
+  it("returns 403 when any requested account is unauthorized", async () => {
+    vi.mocked(validateAuthContext).mockResolvedValue({
+      accountId: "account-123",
+      orgId: null,
+      authToken: "token",
+    });
+    vi.mocked(checkAccountAccess)
+      .mockResolvedValueOnce({ hasAccess: true, entityType: "self" })
+      .mockResolvedValueOnce({ hasAccess: false });
+
+    const result = await validateGetAccountEmailsQuery(
+      createMockRequest(
+        "http://localhost:3000/api/accounts/emails?account_id=acc-1&account_id=acc-2",
+      ),
+    );
+
+    expect(result).toBeInstanceOf(NextResponse);
+    expect(checkAccountAccess).toHaveBeenCalledWith("account-123", "acc-1");
+    expect(checkAccountAccess).toHaveBeenCalledWith("account-123", "acc-2");
+    if (result instanceof NextResponse) {
+      expect(result.status).toBe(403);
+      await expect(result.json()).resolves.toEqual({ error: "Unauthorized" });
+    }
+  });
+});
diff --git a/lib/accounts/getAccountEmailsHandler.ts b/lib/accounts/getAccountEmailsHandler.ts
new file mode 100644
index 00000000..70656e2d
--- /dev/null
+++ b/lib/accounts/getAccountEmailsHandler.ts
@@ -0,0 +1,32 @@
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { getCorsHeaders } from "@/lib/networking/getCorsHeaders";
+import { validateGetAccountEmailsQuery } from "@/lib/accounts/validateGetAccountEmailsQuery";
+import selectAccountEmails from "@/lib/supabase/account_emails/selectAccountEmails";
+
+/**
+ * Handles GET /api/accounts/emails requests.
+ */
+export async function getAccountEmailsHandler(request: NextRequest): Promise<NextResponse> {
+  const validatedQuery = await validateGetAccountEmailsQuery(request);
+  if (validatedQuery instanceof NextResponse) {
+    return validatedQuery;
+  }
+
+  try {
+    const emails = await selectAccountEmails({ accountIds: validatedQuery.accountIds });
+
+    return NextResponse.json(emails, {
+      status: 200,
+      headers: getCorsHeaders(),
+    });
+  } catch {
+    return NextResponse.json(
+      { error: "Failed to fetch account emails" },
+      {
+        status: 500,
+        headers: getCorsHeaders(),
+      },
+    );
+  }
+}
diff --git a/lib/accounts/validateGetAccountEmailsQuery.ts b/lib/accounts/validateGetAccountEmailsQuery.ts
new file mode 100644
index 00000000..e3785afc
--- /dev/null
+++ b/lib/accounts/validateGetAccountEmailsQuery.ts
@@ -0,0 +1,71 @@
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { getCorsHeaders } from "@/lib/networking/getCorsHeaders";
+import { checkAccountAccess } from "@/lib/auth/checkAccountAccess";
+import { validateAuthContext } from "@/lib/auth/validateAuthContext";
+
+export const getAccountEmailsQuerySchema = z.object({
+  account_id: z
+    .array(z.string())
+    .min(1, "At least one account_id parameter is required")
+    .describe("Repeat this query parameter to fetch one or more account email rows."),
+});
+
+export interface ValidatedGetAccountEmailsQuery {
+  authenticatedAccountId: string;
+  accountIds: string[];
+}
+
+/**
+ * Validates auth and query params for GET /api/accounts/emails.
+ */
+export async function validateGetAccountEmailsQuery(
+  request: NextRequest,
+): Promise<NextResponse | ValidatedGetAccountEmailsQuery> {
+  const authResult = await validateAuthContext(request);
+  if (authResult instanceof NextResponse) {
+    return authResult;
+  }
+
+  const { searchParams } = new URL(request.url);
+  const validationResult = getAccountEmailsQuerySchema.safeParse({
+    account_id: searchParams.getAll("account_id"),
+  });
+
+  if (!validationResult.success) {
+    const firstError = validationResult.error.issues[0];
+    return NextResponse.json(
+      {
+        status: "error",
+        missing_fields: firstError.path,
+        error: firstError.message,
+      },
+      {
+        status: 400,
+        headers: getCorsHeaders(),
+      },
+    );
+  }
+
+  const accessResults = await Promise.all(
+    validationResult.data.account_id.map(accountId =>
+      checkAccountAccess(authResult.accountId, accountId),
+    ),
+  );
+
+  if (accessResults.some(result => !result.hasAccess)) {
+    return NextResponse.json(
+      { error: "Unauthorized" },
+      {
+        status: 403,
+        headers: getCorsHeaders(),
+      },
+    );
+  }
+
+  return {
+    authenticatedAccountId: authResult.accountId,
+    accountIds: validationResult.data.account_id,
+  };
+}
diff --git a/lib/supabase/account_emails/selectAccountEmails.ts b/lib/supabase/account_emails/selectAccountEmails.ts
index 81f05530..a5fc793a 100644
--- a/lib/supabase/account_emails/selectAccountEmails.ts
+++ b/lib/supabase/account_emails/selectAccountEmails.ts
@@ -1,6 +1,11 @@
 import supabase from "@/lib/supabase/serverClient";
 import type { Tables } from "@/types/database.types";
 
+interface SelectAccountEmailsParams {
+  emails?: string[];
+  accountIds?: string | string[];
+}
+
 /**
  * Select account_emails by email addresses and/or account IDs
  *
@@ -12,10 +17,7 @@ import type { Tables } from "@/types/database.types";
 export default async function selectAccountEmails({
   emails,
   accountIds,
-}: {
-  emails?: string[];
-  accountIds?: string | string[];
-}): Promise<Tables<"account_emails">[]> {
+}: SelectAccountEmailsParams): Promise<Tables<"account_emails">[]> {
   let query = supabase.from("account_emails").select("*");
 
   // Build query based on provided parameters