diff --git a/apps/api/src/services/moderation.ts b/apps/api/src/services/moderation.ts
index 971ad5d..84b1d98 100644
--- a/apps/api/src/services/moderation.ts
+++ b/apps/api/src/services/moderation.ts
@@ -321,7 +321,6 @@ export class ModerationService {
 
     const includeDeactivated = opts.includeDeactivated ?? true;
     const q = opts.q?.trim().toLowerCase() ?? '';
-    const emailSearch = q.includes('@');
 
     let people = [...this.#state.people.values()];
     if (!includeDeactivated) people = people.filter((p) => !p.deletedAt);
@@ -356,10 +355,10 @@ export class ModerationService {
           matched.push(p);
           continue;
         }
-        if (emailSearch) {
-          const email = await emailOf(p);
-          if (email && email.toLowerCase().includes(q)) matched.push(p);
-        }
+        // Email is searched for any query, not just ones with an "@" — a bare
+        // domain or local-part substring is the common case when triaging.
+        const email = await emailOf(p);
+        if (email && email.toLowerCase().includes(q)) matched.push(p);
       }
       people = matched;
     }
diff --git a/apps/api/tests/moderation.test.ts b/apps/api/tests/moderation.test.ts
index 111151f..b9b9f1a 100644
--- a/apps/api/tests/moderation.test.ts
+++ b/apps/api/tests/moderation.test.ts
@@ -217,6 +217,14 @@ describe('moderation API', () => {
     expect(res.statusCode).toBe(422);
   });
 
+  it('search matches an email substring without an @, across the whole roster', async () => {
+    const res = await app.inject({ method: 'GET', url: '/api/admin/members?q=regular%40example', ...asStaff(staffCookie) });
+    expect(res.json<{ data: Array<{ slug: string }> }>().data.map((r) => r.slug)).toEqual(['regular']);
+    const bare = await app.inject({ method: 'GET', url: '/api/admin/members?q=example.org', ...asStaff(staffCookie) });
+    const slugs = bare.json<{ data: Array<{ slug: string }> }>().data.map((r) => r.slug).sort();
+    expect(slugs).toEqual(['newest', 'regular']);
+  });
+
   it('rejects an unknown sort key', async () => {
     const res = await app.inject({ method: 'GET', url: '/api/admin/members?sort=bogus', ...asStaff(staffCookie) });
     expect(res.statusCode).toBe(422);
diff --git a/apps/web/src/pages/AdminMembers.tsx b/apps/web/src/pages/AdminMembers.tsx
index 47ba317..0a04232 100644
--- a/apps/web/src/pages/AdminMembers.tsx
+++ b/apps/web/src/pages/AdminMembers.tsx
@@ -93,6 +93,31 @@ function Badges({ row }: { row: MemberRow }) {
   );
 }
 
+/**
+ * The email with its domain as a button that searches `@domain` across the
+ * whole roster — the quickest way to find every account from a throwaway
+ * domain once one turns up.
+ */
+function EmailWithDomainSearch({ email, onSearchDomain }: { email: string; onSearchDomain: (domain: string) => void }) {
+  const at = email.lastIndexOf('@');
+  if (at === -1) return <span>{email}</span>;
+  const local = email.slice(0, at + 1);
+  const domain = email.slice(at + 1);
+  return (
+    <span>
+      {local}
+      <button
+        type="button"
+        className="underline decoration-dotted underline-offset-2 hover:text-foreground"
+        title={`Search for every member with an @${domain} address`}
+        onClick={() => onSearchDomain(domain)}
+      >
+        {domain}
+      </button>
+    </span>
+  );
+}
+
 function rowTint(row: MemberRow): string {
   const critical = row.signals.some((s) => s === 'github-gone' || s.startsWith('email-bounced'));
   if (critical || row.attention >= 5) return 'border-l-4 border-l-destructive';
@@ -211,6 +236,7 @@ function MemberRowView({
   onPendingHandled,
   onToggle,
   onChanged,
+  onSearchDomain,
 }: {
   row: MemberRow;
   selfSlug: string | undefined;
@@ -220,6 +246,7 @@ function MemberRowView({
   onPendingHandled: () => void;
   onToggle: () => void;
   onChanged: () => Promise<void>;
+  onSearchDomain: (domain: string) => void;
 }) {
   const [changing, setChanging] = useState(false);
   const ref = useRef<HTMLLIElement>(null);
@@ -273,7 +300,12 @@ function MemberRowView({
           </div>
           <div className="mt-1 text-sm text-muted-foreground">
             joined {formatRelativeTime(row.createdAt)} · {signIns}
-            {row.email ? ` · ${row.email}` : ''}
+            {row.email && (
+              <>
+                {' · '}
+                <EmailWithDomainSearch email={row.email} onSearchDomain={onSearchDomain} />
+              </>
+            )}
           </div>
           {row.bioExcerpt && <p className="mt-1 text-sm">{row.bioExcerpt}</p>}
           <div className="mt-1 text-xs text-muted-foreground">{counts.join(' · ')}</div>
@@ -497,7 +529,14 @@ export function AdminMembers() {
       >
         <div className="flex flex-col gap-1">
           <Label htmlFor="q" className="text-xs">Search</Label>
-          <Input id="q" name="q" defaultValue={listParams.q ?? ''} placeholder="name, @slug, bio, email" className="w-64" />
+          <Input
+            id="q"
+            name="q"
+            key={listParams.q ?? ''}
+            defaultValue={listParams.q ?? ''}
+            placeholder="name, @slug, bio, email, @domain"
+            className="w-64"
+          />
         </div>
         <div className="flex flex-col gap-1">
           <Label htmlFor="vote" className="text-xs">Vote</Label>
@@ -574,6 +613,7 @@ export function AdminMembers() {
                   setExpanded(expanded === row.slug ? null : row.slug);
                 }}
                 onChanged={refresh}
+                onSearchDomain={(domain) => setParam('q', `@${domain}`)}
               />
             ))}
           </ul>
diff --git a/plans/roster-email-search.md b/plans/roster-email-search.md
new file mode 100644
index 0000000..a8e215b
--- /dev/null
+++ b/plans/roster-email-search.md
@@ -0,0 +1,43 @@
+---
+status: done
+depends: [roster-signals]
+specs:
+  - specs/api/moderation.md
+  - specs/screens/admin-members.md
+issues: []
+pr: 191
+---
+
+# Plan: roster search covers email; domain pivot
+
+## Scope
+
+Two things found on the first day of triage: searching for an email
+substring did nothing unless the query contained an `@` (an accidental gate
+in `listMembers`), and once one throwaway domain turns up staff want every
+other account from it in one click.
+
+In: search email for every query; the email's domain on each row is a button
+that searches `@domain` across the whole roster. Out: a domain histogram.
+
+## Implements
+
+- [api/moderation.md](../specs/api/moderation.md) — `q` matches email for
+  any query and applies to the whole roster before pagination.
+- [screens/admin-members.md](../specs/screens/admin-members.md) — the domain
+  button.
+
+## Approach
+
+Drop the `@` gate in `ModerationService.listMembers`; `EmailWithDomainSearch`
+in the page sets `q=@domain`; the search input remounts on `q` so the URL
+drives it.
+
+## Validation
+
+- API test: `q=example.org` returns both seeded members with that domain.
+- `type-check` + `lint`; moderation suite green.
+
+## Follow-ups
+
+None.
diff --git a/specs/api/moderation.md b/specs/api/moderation.md
index 43c44eb..780792e 100644
--- a/specs/api/moderation.md
+++ b/specs/api/moderation.md
@@ -21,7 +21,7 @@ a signal.
 
 | Param | Type | Notes |
 | ----- | ---- | ----- |
-| `q` | string | Full-text on `fullName`, `slug`, `bio`, and (staff-visible) `email`. |
+| `q` | string | Substring match on `fullName`, `slug`, `bio`, and (staff-visible) `email` — searched for every query, so `.com` finds every member on that domain. Applies to the whole roster, then paginates. |
 | `vote` | enum | `none` (no human vote yet) \| `spam` \| `legit`. Filters on the **latest** human vote. |
 | `origin` | enum | `imported` (has a laddr `legacyId`) \| `signed-up` (created on this site through GitHub). |
 | `joinedAfter`, `joinedBefore` | ISO date | Inclusive bounds on `createdAt`. |
diff --git a/specs/screens/admin-members.md b/specs/screens/admin-members.md
index 8e06c2a..b1c4bd4 100644
--- a/specs/screens/admin-members.md
+++ b/specs/screens/admin-members.md
@@ -36,7 +36,9 @@ See [api/moderation.md](../api/moderation.md).
   what it hid).
 - Each row: avatar, `fullName` (link to the public profile, opens in a new tab),
   `@slug`, then the **badges**, then "joined {createdAt relative}", sign-ins
-  (`signed in 4× · last 2h ago` or `never signed in`), email (staff-visible),
+  (`signed in 4× · last 2h ago` or `never signed in`), email (staff-visible;
+  the domain is a button that searches `@domain` across the whole roster, so
+  one throwaway address leads to every account from that domain),
   bio excerpt, compact footprint counts (`2 projects · 1 update · 3 tags`), and
   the vote state:
   - no vote → two buttons **Spam** / **Not spam**