diff --git a/src/api/__tests__/live-stalwart-delegation.test.ts b/src/api/__tests__/live-stalwart-delegation.test.ts
index f2a3dcfd..ed20f910 100644
--- a/src/api/__tests__/live-stalwart-delegation.test.ts
+++ b/src/api/__tests__/live-stalwart-delegation.test.ts
@@ -22,6 +22,10 @@ import { JMAPClient } from '../jmap-client';
 import { CAPABILITIES } from '../types';
 import { applyShareChanges, getShareTargets, supportsDelegation, supportsMailboxSharing } from '../delegation';
 import { buildGrantChanges, buildRevokeChanges, summarizeDelegates } from '../../lib/delegation/delegation';
+import { principalRowDisplay, resolvePrincipal } from '../../lib/delegation/display';
+import { listPrincipals } from '../files';
+
+const t = (_key: string, fallback?: string) => fallback ?? '';
 
 const SERVER = process.env.BULWARK_LIVE_JMAP;
 const USER = process.env.BULWARK_LIVE_USER ?? 'usera@example.org';
@@ -120,4 +124,32 @@ live('live Stalwart: delegates', () => {
     expect(gone.calendars.filter((id) => changes.some((c) => c.id === id))).toEqual([]);
     expect(gone.addressBooks.filter((id) => changes.some((c) => c.id === id))).toEqual([]);
   }, 120_000);
+
+  // Stalwart 1.0 with directory queries off (VM 106's 1.0.1) names nobody
+  // the owner merely shares with: Principal/get answers notFound for the
+  // delegate's id, a letter or two. The row reads "Unknown person" then, not
+  // "Unknown person / e"; 0.16 names them.
+  it('names who has access where the server lets it, and shows no id where it does not', async () => {
+    const { targets } = await getShareTargets();
+    const principalId = delegate.accountId;
+    const results = await applyShareChanges(buildGrantChanges(targets, principalId, { mail: 'none', calendars: 'none', addressBooks: 'default' }, 'read'));
+    expect(results.filter((r) => !r.ok)).toEqual([]);
+    try {
+      const listing = await listPrincipals();
+      const sessionAccounts = new Map(Object.entries(owner.currentSession?.accounts ?? {})
+        .filter(([id]) => id !== owner.accountId)
+        .map(([id, info]) => [id, info.name]));
+      const principal = resolvePrincipal(principalId, { directory: listing.principals, remembered: new Map(), sessionAccounts });
+      const row = principalRowDisplay(principal, t);
+      if (listing.directoryQueriesOff) {
+        expect(principal).toBeNull();
+        expect(row).toEqual({ name: 'Unknown person', detail: null });
+      } else {
+        expect(principal?.email?.toLowerCase()).toBe(USER2!.toLowerCase());
+        expect(row.name).not.toBe('Unknown person');
+      }
+    } finally {
+      expect(await revokeAll()).toBe(true);
+    }
+  }, 120_000);
 });
diff --git a/src/components/sharing/ShareCollectionSheet.tsx b/src/components/sharing/ShareCollectionSheet.tsx
index 59e82ff9..48d2c9bd 100644
--- a/src/components/sharing/ShareCollectionSheet.tsx
+++ b/src/components/sharing/ShareCollectionSheet.tsx
@@ -164,8 +164,10 @@ export function ShareCollectionSheet<R extends object>({
         <Text style={styles.principalName} numberOfLines={1}>
           {p?.description || p?.name || (unresolved ? t('sharing.unknown_user', 'Unknown user') : principalId)}
         </Text>
-        {p?.email || unresolved ? (
-          <Text style={styles.principalEmail} numberOfLines={1}>{p?.email || principalId}</Text>
+        {/* Never the id in its place: Stalwart 1.0's are a letter or two
+            ("e") and read as a broken address. */}
+        {p?.email ? (
+          <Text style={styles.principalEmail} numberOfLines={1}>{p.email}</Text>
         ) : null}
       </View>
     );
diff --git a/src/lib/delegation/__tests__/unknown-principal.test.ts b/src/lib/delegation/__tests__/unknown-principal.test.ts
new file mode 100644
index 00000000..4159ce37
--- /dev/null
+++ b/src/lib/delegation/__tests__/unknown-principal.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest';
+import fs from 'node:fs';
+import path from 'node:path';
+import { translate } from '../../../i18n';
+import { principalRowDisplay, resolvePrincipal } from '../display';
+
+const tEn = (key: string, fallback?: string, params?: Record<string, string | number>) => translate('en', key, fallback, params);
+
+describe('someone with access the server does not name', () => {
+  // Stalwart 1.0 with directory queries off: Principal/get answers notFound
+  // for the sharee's id ("e") and the session does not list them.
+  it('reads as "Unknown person" without the id as an address', () => {
+    const principal = resolvePrincipal('e', { directory: [], remembered: new Map(), sessionAccounts: new Map() });
+    expect(principal).toBeNull();
+    expect(principalRowDisplay(principal, tEn)).toEqual({ name: 'Unknown person', detail: null });
+  });
+
+  it('reads as the person when the directory names them (0.16)', () => {
+    const userB = { id: 'e', type: 'individual' as const, name: 'userb@example.org', email: 'userb@example.org', description: 'User B' };
+    const principal = resolvePrincipal('e', { directory: [userB], remembered: new Map(), sessionAccounts: new Map() });
+    expect(principalRowDisplay(principal, tEn)).toEqual({ name: 'userb@example.org', detail: 'User B' });
+  });
+
+  it('gets no id for an address line in the calendar and address book share sheet', () => {
+    const sheet = fs.readFileSync(path.resolve(__dirname, '../../../components/sharing/ShareCollectionSheet.tsx'), 'utf8');
+    const label = sheet.slice(sheet.indexOf('const renderPrincipalLabel'), sheet.indexOf('return (', sheet.indexOf('const renderPrincipalLabel')) + 900);
+    expect(label).not.toMatch(/p\?\.email \|\| principalId/);
+    expect(label).toMatch(/\{p\?\.email \? \(/);
+  });
+});
diff --git a/src/lib/delegation/display.ts b/src/lib/delegation/display.ts
index 540063d3..c3de31be 100644
--- a/src/lib/delegation/display.ts
+++ b/src/lib/delegation/display.ts
@@ -17,6 +17,17 @@ export function principalDisplay(principal: Pick<Principal, 'id' | 'name' | 'ema
   return { name, detail };
 }
 
+/**
+ * The row for someone with access: the principal's name and address, or
+ * "Unknown person" with nothing under it. Stalwart 1.0 with directory
+ * queries off names nobody the user merely shares with; its ids are a
+ * letter or two ("e"), which read as a broken address when shown.
+ */
+export function principalRowDisplay(principal: Principal | null, t: Translate): { name: string; detail: string | null } {
+  if (principal) return principalDisplay(principal);
+  return { name: t('delegates.unknown_person', 'Unknown person'), detail: null };
+}
+
 /**
  * The principal behind an id: from the directory, the names kept on this
  * device, or, as a last way to name someone the directory won't (Stalwart