diff --git a/app/client/models/UserManagerModel.ts b/app/client/models/UserManagerModel.ts
index 36dc8acc..847f4c4f 100644
--- a/app/client/models/UserManagerModel.ts
+++ b/app/client/models/UserManagerModel.ts
@@ -6,6 +6,7 @@ import {ShareAnnotations, ShareAnnotator} from 'app/common/ShareAnnotator';
 import {normalizeEmail} from 'app/common/emails';
 import {GristLoadConfig} from 'app/common/gristUrls';
 import * as roles from 'app/common/roles';
+import {getGristConfig} from 'app/common/urlUtils';
 import {ANONYMOUS_USER_EMAIL, Document, EVERYONE_EMAIL, FullUser, getRealAccess, Organization,
         PermissionData, PermissionDelta, UserAPI, Workspace} from 'app/common/UserAPI';
 import {computed, Computed, Disposable, obsArray, ObsArray, observable, Observable} from 'grainjs';
@@ -179,7 +180,8 @@ export class UserManagerModelImpl extends Disposable implements UserManagerModel
     super();
     if (this._options.appModel) {
       const product = this._options.appModel.currentProduct;
-      this._shareAnnotator = new ShareAnnotator(product, initData);
+      const {supportEmail} = getGristConfig();
+      this._shareAnnotator = new ShareAnnotator(product, initData, {supportEmail});
     }
     this.annotate();
   }
diff --git a/app/common/ShareAnnotator.ts b/app/common/ShareAnnotator.ts
index 720b344f..cf5fc329 100644
--- a/app/common/ShareAnnotator.ts
+++ b/app/common/ShareAnnotator.ts
@@ -28,14 +28,23 @@ export interface ShareAnnotations {
   users: Map<string, ShareAnnotation>;  // Annotations keyed by normalized user email.
 }
 
+export interface ShareAnnotatorOptions {
+  supportEmail?: string;   // Known email address of the support user (e.g. support@getgrist.com).
+}
+
 /**
  * Helper for annotating users mentioned in a proposed change of shares, given the
  * current shares in place.
  */
 export class ShareAnnotator {
   private _features = this._product?.features ?? {};
+  private _supportEmail = this._options.supportEmail;
 
-  constructor(private _product: Product|null, private _state: PermissionData) {
+  constructor(
+    private _product: Product|null,
+    private _state: PermissionData,
+    private _options: ShareAnnotatorOptions = {}
+  ) {
   }
 
   public updateState(state: PermissionData) {
@@ -84,7 +93,10 @@ export class ShareAnnotator {
         .map(([k, ]) => normalizeEmail(k)));
     for (const email of tweaks) {
       const annotation = annotations.users.get(email) || makeAnnotation({
-        email, isMember: false, access: '<set>',
+        email,
+        isMember: false,
+        isSupport: Boolean(email.trim() !== '' && email === this._supportEmail),
+        access: '<set>',
       });
       annotations.users.set(email, annotation);
     }
diff --git a/app/common/gristUrls.ts b/app/common/gristUrls.ts
index 49450133..19e3199f 100644
--- a/app/common/gristUrls.ts
+++ b/app/common/gristUrls.ts
@@ -493,7 +493,7 @@ export interface GristLoadConfig {
 
   // In single-org mode, this is the single well-known org. Suppress any org selection UI.
   singleOrg?: string;
-  
+
   // Url for support for the browser client to use.
   helpCenterUrl?: string;
 
@@ -578,6 +578,9 @@ export interface GristLoadConfig {
 
   // TODO: remove when comments will be released.
   featureComments?: boolean;
+
+  // Email address of the support user.
+  supportEmail?: string;
 }
 
 export const HideableUiElements = StringUnion("helpCenter", "billing", "templates", "multiSite", "multiAccounts");
diff --git a/app/server/lib/sendAppPage.ts b/app/server/lib/sendAppPage.ts
index 3a1bd0d0..28a300b2 100644
--- a/app/server/lib/sendAppPage.ts
+++ b/app/server/lib/sendAppPage.ts
@@ -1,6 +1,7 @@
 import {getPageTitleSuffix, GristLoadConfig, HideableUiElements, IHideableUiElement} from 'app/common/gristUrls';
 import {getTagManagerSnippet} from 'app/common/tagManager';
 import {Document} from 'app/common/UserAPI';
+import {SUPPORT_EMAIL} from 'app/gen-server/lib/HomeDBManager';
 import {isAnonymousUser, RequestWithLogin} from 'app/server/lib/Authorizer';
 import {RequestWithOrg} from 'app/server/lib/extractOrg';
 import {GristServer} from 'app/server/lib/GristServer';
@@ -63,6 +64,7 @@ export function makeGristConfig(homeUrl: string|null, extra: Partial<GristLoadCo
     supportedLngs: readLoadedLngs(req?.i18n),
     namespaces: readLoadedNamespaces(req?.i18n),
     featureComments: process.env.COMMENTS === "true",
+    supportEmail: SUPPORT_EMAIL,
     ...extra,
   };
 }