diff --git a/docs/content/docs/guides/campaigns.mdx b/docs/content/docs/guides/campaigns.mdx
index 7dff6280f..2a40b96b3 100644
--- a/docs/content/docs/guides/campaigns.mdx
+++ b/docs/content/docs/guides/campaigns.mdx
@@ -26,7 +26,7 @@ Campaign names take priority over descriptions in the list. Descriptions use the
 **Campaigns** > **New campaign** opens a four-step flow. A campaign is a first email and, optionally, follow-ups that stop for anyone who replies.
 
 1. **Leads**: name the campaign at the top (left blank, it is named after its first list, or "Campaign" and the date; rename it any time), then pick one or more lead lists. Lists are your [segments](/guides/segments/), shown with how many leads each holds; someone on several lists is emailed once, and the total below counts each lead once. **Import new leads** takes you to Contacts to bring in a CSV and keeps the draft for when you return. Picking no list is fine: **Continue without leads** creates the campaign so you can add leads afterwards.
-2. **Emails**: the same editor as the Steps tab, with templates, **Write with AI**, variables, a preview rendered through the send engine and the content score. Add follow-ups here, each sent a number of days after the previous email (and stopping for anyone who replies, when **Stop on reply** is on). **Add the usual two follow-ups** adds two at 3 and 7 days. A follow-up with no subject replies in the same thread. The emails can also be left for the Steps tab, where you can branch them and add A/B variants.
+2. **Emails**: the same editor as the Steps tab, with templates, **Write with AI**, variables, a preview rendered through the send engine and the content score. Selecting a template applies both its saved subject and its body. A template without a subject keeps the email's existing subject. Add follow-ups here, each sent a number of days after the previous email (and stopping for anyone who replies, when **Stop on reply** is on). **Add the usual two follow-ups** adds two at 3 and 7 days. A follow-up with no subject replies in the same thread. The emails can also be left for the Steps tab, where you can branch them and add A/B variants.
 3. **Schedule**: start at launch or on a date, the timezone, sending days and hours, the mailbox tags to send from, and the daily limit per mailbox. Every mailbox in the pool is listed with what it can send: **Ramping up** while it is still graduating from warmup, **Reduced volume** in a watch or throttled health band, **On hold**, **DNS failing** or **Resting** when it will not send. Tracking, UTM parameters, the unsubscribe header and stop on reply are under **Tracking and replies**.
 4. **Review**: the finish date and a day-by-day chart of first emails and follow-ups against what the pool can send, what is setting the pace, and a summary with a link back to each step.
 
diff --git a/docs/content/docs/guides/mailboxes.mdx b/docs/content/docs/guides/mailboxes.mdx
index 219fefc99..a602c02af 100644
--- a/docs/content/docs/guides/mailboxes.mdx
+++ b/docs/content/docs/guides/mailboxes.mdx
@@ -5,6 +5,10 @@ description: "Connect sender accounts, providers, and how they are assigned to w
 
 A mailbox is a sender account you connect to Warmbly. Every warmup message and campaign email goes out through one you own.
 
+## Filtering accounts
+
+Use the **Tags** dropdown above the mailbox list to show accounts with a particular tag. The selection is kept in the page URL, so refreshing the page or opening a bookmark keeps the filter. Choose **All accounts** to clear it. A tag that no longer exists in the current workspace falls back to **All accounts**.
+
 ## Connecting an account
 
 Open **Accounts** and choose **Add account**. Google and Microsoft each have one entry, and choosing it asks how to connect:
diff --git a/web/src/app/app/emails/page.tsx b/web/src/app/app/emails/page.tsx
index 59f217fbf..ca09e7335 100644
--- a/web/src/app/app/emails/page.tsx
+++ b/web/src/app/app/emails/page.tsx
@@ -1,6 +1,6 @@
 import { RiFireLine, RiMoreLine } from "@remixicon/react";
 import React, { useEffect, useMemo, useRef } from "react";
-import { useSearchParams } from "@/hooks/useSearchParams";
+import { useSearchParam, useSearchParams } from "@/hooks/useSearchParams";
 import toast from "react-hot-toast/headless";
 import { useQueryClient } from "@tanstack/react-query";
 import useEmails from "@/lib/api/hooks/app/emails/useEmails";
@@ -127,7 +127,8 @@ export default function AddressesPage() {
     const canView = usePermission("MANAGE_EMAILS");
 
     const [query, setQuery] = React.useState<string>("");
-    const [tag, setTag] = React.useState<string>("");
+    const [selectedTag, setTag] = useSearchParam("tag");
+    const tag = p.user.tags.some((t) => t.id === selectedTag) ? selectedTag : "";
     const emailsData = useEmails({ query, tag });
     const [selected, setSelected] = React.useState<string[]>([]);
     const [view, setView] = React.useState<string>("");
diff --git a/web/src/components/app/campaigns/NewCampaignDialog.tsx b/web/src/components/app/campaigns/NewCampaignDialog.tsx
index 88884b033..ce447f123 100644
--- a/web/src/components/app/campaigns/NewCampaignDialog.tsx
+++ b/web/src/components/app/campaigns/NewCampaignDialog.tsx
@@ -53,6 +53,7 @@ import {
 } from "./new/draft";
 import { draftSignature, freshMeta, loadServerDraft, saveServerDraft, type DraftMeta } from "./new/serverDraft";
 import { EmailsStep, LeadsStep, LaunchPlanRail, ReviewStep, ScheduleStep, type EstimateState } from "./new/steps";
+import type { Patch } from "./new/fields";
 
 interface Props {
     open: boolean;
@@ -146,9 +147,12 @@ export function NewCampaignDialog({ open, onClose, draftId = null }: Props) {
         }
     }, [open, draftId, defaultTimezone]);
 
-    const patch = React.useCallback((p: Partial<Draft>) => {
-        if (p.timezone !== undefined) tzTouched.current = true;
-        setDraft((d) => ({ ...d, ...p }));
+    const patch = React.useCallback<Patch>((p) => {
+        setDraft((d) => {
+            const update = typeof p === "function" ? p(d) : p;
+            if (update.timezone !== undefined) tzTouched.current = true;
+            return { ...d, ...update };
+        });
     }, []);
 
     // Names for the auto name and the review.
diff --git a/web/src/components/app/campaigns/new/fields.tsx b/web/src/components/app/campaigns/new/fields.tsx
index f8e8ebbe8..594f80dae 100644
--- a/web/src/components/app/campaigns/new/fields.tsx
+++ b/web/src/components/app/campaigns/new/fields.tsx
@@ -13,7 +13,7 @@ import { followWorkspaceLabel, timezoneOptions } from "@/lib/timezone";
 import { cn } from "@/lib/utils";
 import { EVERY_DAY_MASK, WEEKDAYS, WEEKDAYS_MASK, daysLabel, fmt12, type Draft } from "./draft";
 
-export type Patch = (p: Partial<Draft>) => void;
+export type Patch = (p: Partial<Draft> | ((draft: Draft) => Partial<Draft>)) => void;
 
 export function StepIntro({ title, hint, children }: { title: string; hint?: string; children?: React.ReactNode }) {
     return (
diff --git a/web/src/components/app/campaigns/new/steps.tsx b/web/src/components/app/campaigns/new/steps.tsx
index ad2e78908..d49d08549 100644
--- a/web/src/components/app/campaigns/new/steps.tsx
+++ b/web/src/components/app/campaigns/new/steps.tsx
@@ -287,7 +287,7 @@ function EmailsEditor({
     const index = Math.min(selected, draft.emails.length - 1);
     const email = draft.emails[index];
     const update = (i: number, p: Partial<Draft["emails"][number]>) =>
-        patch({ emails: draft.emails.map((e, idx) => (idx === i ? { ...e, ...p } : e)) });
+        patch((d) => ({ emails: d.emails.map((e, idx) => (idx === i ? { ...e, ...p } : e)) }));
     const add = (wait: number) => {
         patch({ emails: [...draft.emails, newEmail(wait)] });
         setSelected(draft.emails.length);
diff --git a/web/src/components/app/campaigns/sequences/templateApplication.test.tsx b/web/src/components/app/campaigns/sequences/templateApplication.test.tsx
new file mode 100644
index 000000000..7848c53ad
--- /dev/null
+++ b/web/src/components/app/campaigns/sequences/templateApplication.test.tsx
@@ -0,0 +1,136 @@
+import React from "react";
+import { act, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type Sequence from "@/lib/api/models/app/campaigns/sequences/Sequence";
+import SequenceView from "./SequenceView";
+import { EmailsStep } from "../new/steps";
+import { initialDraft, type Draft } from "../new/draft";
+import type { Patch } from "../new/fields";
+
+const f = vi.hoisted(() => ({
+    save: vi.fn(),
+    confirm: vi.fn(),
+    templates: [{ id: "template-id", name: "Cold open", subject: "Hello {{.FirstName}}", body_html: "<p>Template body</p>", body_plain: "Template body" }],
+}));
+
+vi.mock("@/lib/api/hooks/app/templates/useTemplates", () => ({ default: () => ({ data: f.templates }) }));
+vi.mock("@/lib/api/hooks/app/templates/useCreateTemplate", () => ({ default: () => ({ isPending: false }) }));
+vi.mock("@/lib/api/hooks/app/campaigns/sequences/useUpdateSequence", () => ({ default: () => ({ mutateAsync: f.save }) }));
+vi.mock("@/lib/api/hooks/app/campaigns/useCampaign", () => ({ default: () => ({ data: undefined }) }));
+vi.mock("@/lib/api/hooks/app/campaigns/useTemplatePreview", () => ({ useTemplatePreview: () => ({ mutateAsync: vi.fn() }) }));
+vi.mock("@/hooks/context/confirm", () => ({ useConfirm: () => ({ show: f.confirm }) }));
+vi.mock("@/components/app/flow/dirty", () => ({ useReportDirty: () => undefined }));
+vi.mock("./previewContext", () => ({
+    useCampaignSenderInboxes: () => ({ inboxes: [] }),
+    SAMPLE_CONTACT_LABEL: "Sample contact",
+    contactLabel: () => "Contact",
+}));
+vi.mock("./RichTextEditor", () => ({
+    default: ({ html }: { html: string }) => <output aria-label="Email body">{html}</output>,
+    VariableMenu: () => null,
+}));
+vi.mock("./StepAttachments", () => ({ default: () => null }));
+vi.mock("@/components/ui/scroll-strip", () => ({ default: ({ children }: { children: React.ReactNode }) => <div>{children}</div> }));
+vi.mock("../ContentScore", () => ({ default: () => null }));
+vi.mock("./PreviewControls", () => ({ PlacementTestButton: () => null, PreviewContactPicker: () => null, PreviewMailboxPicker: () => null, SendTestButton: () => null }));
+
+const step: Sequence = {
+    id: "step-id", name: "Opening email", subject: "", body_html: "", body_plain: "", body_code: false,
+    body_sync: true, thread_reply: true, kind: "email", wait_after: 0, x: 0, y: 0,
+    created_at: new Date(0), updated_at: new Date(0),
+};
+
+async function selectTemplate() {
+    fireEvent.click(screen.getByRole("button", { name: "Templates" }));
+    fireEvent.click(await screen.findByRole("button", { name: /Cold open/ }));
+}
+
+function NewCampaignEmails({ initial, selected = 0 }: { initial?: Draft; selected?: number }) {
+    const [draft, setDraft] = React.useState(() => initial ?? initialDraft("UTC"));
+    const patch: Patch = (p) => setDraft((d) => ({ ...d, ...(typeof p === "function" ? p(d) : p) }));
+    return <>
+        <EmailsStep draft={draft} patch={patch} selected={selected} setSelected={() => undefined} />
+        <output aria-label="New campaign subject">{draft.emails[selected].subject}</output>
+        <output aria-label="New campaign body">{draft.emails[selected].body_html}</output>
+        <output aria-label="New campaign emails">{JSON.stringify(draft.emails)}</output>
+    </>;
+}
+
+describe("campaign template application", () => {
+    beforeEach(() => {
+        f.save.mockReset().mockResolvedValue(undefined);
+        f.confirm.mockReset();
+        f.templates[0].subject = "Hello {{.FirstName}}";
+    });
+
+    it("retains both template fields in the new campaign wizard's draft", async () => {
+        render(<NewCampaignEmails />);
+        await selectTemplate();
+        expect(screen.getByLabelText("New campaign subject")).toHaveTextContent("Hello {{.FirstName}}");
+        expect(screen.getByLabelText("New campaign body")).toHaveTextContent("<p>Template body</p>");
+    });
+
+    it("replaces both wizard fields after confirmation rather than restoring the old subject", async () => {
+        const initial = initialDraft("UTC");
+        initial.emails[0] = { ...initial.emails[0], subject: "Original subject", body_html: "<p>Original body</p>" };
+        render(<NewCampaignEmails initial={initial} />);
+        await selectTemplate();
+        expect(screen.getByLabelText("New campaign subject")).toHaveTextContent("Original subject");
+        act(() => f.confirm.mock.calls[0][1]());
+        expect(screen.getByLabelText("New campaign subject")).toHaveTextContent("Hello {{.FirstName}}");
+        expect(screen.getByLabelText("New campaign body")).toHaveTextContent("<p>Template body</p>");
+    });
+
+    it("applies the template only to the selected wizard email, preserving the other draft emails", async () => {
+        const initial = initialDraft("UTC");
+        initial.emails[0].subject = "Keep opener";
+        initial.emails.push({ ...initial.emails[0], id: "follow-up", subject: "", wait_after: 3 });
+        render(<NewCampaignEmails initial={initial} selected={1} />);
+        await selectTemplate();
+        expect(screen.getByLabelText("New campaign subject")).toHaveTextContent("Hello {{.FirstName}}");
+        expect(screen.getByLabelText("New campaign body")).toHaveTextContent("<p>Template body</p>");
+        const emails = JSON.parse(screen.getByLabelText("New campaign emails").textContent!);
+        expect(emails[0]).toEqual(initial.emails[0]);
+        expect(emails[1].wait_after).toBe(3);
+    });
+
+    it("copies and saves the subject and body together on a new campaign opening step", async () => {
+        render(<SequenceView campaignId="campaign-id" sequence={step} index={0} />);
+        await selectTemplate();
+        expect(screen.getByPlaceholderText("Quick question, {{.FirstName}}")).toHaveValue("Hello {{.FirstName}}");
+        expect(screen.getByLabelText("Email body")).toHaveTextContent("<p>Template body</p>");
+        expect(f.confirm).not.toHaveBeenCalled();
+        fireEvent.click(screen.getByRole("button", { name: "Save changes" }));
+        await waitFor(() => expect(f.save).toHaveBeenCalledWith({ subject: "Hello {{.FirstName}}", body_html: "<p>Template body</p>", body_plain: "Template body" }));
+    });
+
+    it("waits for confirmation before replacing an existing subject and body", async () => {
+        render(<SequenceView campaignId="campaign-id" sequence={{ ...step, subject: "Original subject", body_html: "<p>Original body</p>" }} index={0} />);
+        await selectTemplate();
+        expect(f.confirm).toHaveBeenCalledOnce();
+        expect(screen.getByPlaceholderText("Quick question, {{.FirstName}}")).toHaveValue("Original subject");
+        expect(screen.getByLabelText("Email body")).toHaveTextContent("<p>Original body</p>");
+        act(() => f.confirm.mock.calls[0][1]());
+        expect(screen.getByPlaceholderText("Quick question, {{.FirstName}}")).toHaveValue("Hello {{.FirstName}}");
+        expect(screen.getByLabelText("Email body")).toHaveTextContent("<p>Template body</p>");
+    });
+
+    it("keeps an existing subject when the selected template has none", async () => {
+        f.templates[0].subject = "";
+        render(<SequenceView campaignId="campaign-id" sequence={{ ...step, subject: "Keep this subject" }} index={0} />);
+        await selectTemplate();
+        act(() => f.confirm.mock.calls[0][1]());
+        expect(screen.getByPlaceholderText("Quick question, {{.FirstName}}")).toHaveValue("Keep this subject");
+        expect(screen.getByLabelText("Email body")).toHaveTextContent("<p>Template body</p>");
+    });
+
+    it("keeps a follow-up's inherited conversation subject and only saves its body", async () => {
+        render(<SequenceView campaignId="campaign-id" sequence={step} index={1} conversationSubject="Conversation opener" />);
+        await selectTemplate();
+        act(() => f.confirm.mock.calls[0][1]());
+        expect(screen.queryByPlaceholderText("Quick question, {{.FirstName}}")).not.toBeInTheDocument();
+        expect(screen.getByText("Conversation opener")).toBeInTheDocument();
+        fireEvent.click(screen.getByRole("button", { name: "Save changes" }));
+        await waitFor(() => expect(f.save).toHaveBeenCalledWith({ body_html: "<p>Template body</p>", body_plain: "Template body" }));
+    });
+});
diff --git a/web/src/hooks/useSearchParams.test.tsx b/web/src/hooks/useSearchParams.test.tsx
new file mode 100644
index 000000000..9abbbaab4
--- /dev/null
+++ b/web/src/hooks/useSearchParams.test.tsx
@@ -0,0 +1,60 @@
+import { act, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { createMemoryHistory, createRootRoute, createRoute, createRouter, Outlet, RouterProvider } from "@tanstack/react-router";
+import { describe, expect, it } from "vitest";
+import { parseSearch, stringifySearch } from "@/lib/routerSearch";
+import { useSearchParam, useSearchParams } from "./useSearchParams";
+
+function Filters() {
+    const [tag, setTag] = useSearchParam("tag");
+    const [, setParams] = useSearchParams();
+    return <>
+        <output aria-label="Tag filter">{tag || "All accounts"}</output>
+        <button onClick={() => setTag("sending-tag")}>Sending Account</button>
+        <button onClick={() => setTag("")}>All accounts</button>
+        <button onClick={() => setParams((prev) => {
+            const next = new URLSearchParams(prev);
+            next.delete("mailbox");
+            next.delete("tab");
+            return next;
+        }, { replace: true })}>Consume mailbox link</button>
+    </>;
+}
+
+async function open(href: string) {
+    const root = createRootRoute({ component: Outlet });
+    const route = createRoute({ getParentRoute: () => root, path: "/app/emails", component: Filters });
+    const history = createMemoryHistory({ initialEntries: [href] });
+    const router = createRouter({ routeTree: root.addChildren([route]), history, parseSearch, stringifySearch });
+    await act(() => router.load());
+    return { router, ...render(<RouterProvider router={router} />) };
+}
+
+describe("URL filter selection", () => {
+    it("keeps a selection through a reload without discarding mailbox links", async () => {
+        const page = await open("/app/emails?mailbox=mailbox-id&tab=settings");
+        expect(screen.getByLabelText("Tag filter")).toHaveTextContent("All accounts");
+        fireEvent.click(screen.getByRole("button", { name: "Sending Account" }));
+        await waitFor(() => expect(page.router.state.location.searchStr).toContain("tag=sending-tag"));
+        const href = page.router.state.location.href;
+        expect(href).toContain("mailbox=mailbox-id");
+        expect(href).toContain("tab=settings");
+        page.unmount();
+
+        const reloaded = await open(href);
+        expect(screen.getByLabelText("Tag filter")).toHaveTextContent("sending-tag");
+        fireEvent.click(screen.getByRole("button", { name: "Consume mailbox link" }));
+        await waitFor(() => expect(reloaded.router.state.location.searchStr).toBe("?tag=sending-tag"));
+        expect(screen.getByLabelText("Tag filter")).toHaveTextContent("sending-tag");
+    });
+
+    it("clears only the chosen filter and preserves unrelated search parameters", async () => {
+        const page = await open("/app/emails?tag=sending-tag&mailbox=mailbox-id");
+        fireEvent.click(screen.getByRole("button", { name: "All accounts" }));
+        await waitFor(() => expect(page.router.state.location.searchStr).toBe("?mailbox=mailbox-id"));
+        expect(screen.getByLabelText("Tag filter")).toHaveTextContent("All accounts");
+        const href = page.router.state.location.href;
+        page.unmount();
+        await open(href);
+        expect(screen.getByLabelText("Tag filter")).toHaveTextContent("All accounts");
+    });
+});
diff --git a/web/src/hooks/useSearchParams.ts b/web/src/hooks/useSearchParams.ts
index 254d08312..004c1b49c 100644
--- a/web/src/hooks/useSearchParams.ts
+++ b/web/src/hooks/useSearchParams.ts
@@ -33,3 +33,16 @@ export function useSearchParams(): [
 
     return [params, setParams];
 }
+
+export function useSearchParam(key: string): [string, (value: string) => void] {
+    const [params, setParams] = useSearchParams();
+    const setValue = React.useCallback((value: string) => {
+        setParams((prev) => {
+            const next = new URLSearchParams(prev);
+            if (value) next.set(key, value);
+            else next.delete(key);
+            return next;
+        }, { replace: true });
+    }, [key, setParams]);
+    return [params.get(key) ?? "", setValue];
+}