diff --git a/x-pack/legacy/plugins/siem/public/containers/case/translations.ts b/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
index 92dacad48e7b9..a453be32480e2 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
+++ b/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
@@ -26,13 +26,25 @@ export const DELETED_CASES = (totalCases: number, caseTitle?: string) =>
     defaultMessage: 'Deleted {totalCases, plural, =1 {"{caseTitle}"} other {{totalCases} cases}}',
   });
 
-export const CLOSED_CASES = (totalCases: number, caseTitle?: string) =>
+export const CLOSED_CASES = ({
+  totalCases,
+  caseTitle,
+}: {
+  totalCases: number;
+  caseTitle?: string;
+}) =>
   i18n.translate('xpack.siem.containers.case.closedCases', {
     values: { caseTitle, totalCases },
     defaultMessage: 'Closed {totalCases, plural, =1 {"{caseTitle}"} other {{totalCases} cases}}',
   });
 
-export const REOPENED_CASES = (totalCases: number, caseTitle?: string) =>
+export const REOPENED_CASES = ({
+  totalCases,
+  caseTitle,
+}: {
+  totalCases: number;
+  caseTitle?: string;
+}) =>
   i18n.translate('xpack.siem.containers.case.reopenedCases', {
     values: { caseTitle, totalCases },
     defaultMessage: 'Reopened {totalCases, plural, =1 {"{caseTitle}"} other {{totalCases} cases}}',
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx b/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx
index e2143a6e2e038..7d040c49f1971 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx
+++ b/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx
@@ -77,17 +77,16 @@ export const useUpdateCases = (): UseUpdateCase => {
           const firstTitle = patchResponse[0].title;
 
           dispatch({ type: 'FETCH_SUCCESS', payload: true });
-          if (resultCount && patchResponse[0].status === 'open') {
-            displaySuccessToast(
-              i18n.REOPENED_CASES(resultCount, resultCount === 1 ? firstTitle : ''),
-              dispatchToaster
-            );
-          } else {
-            displaySuccessToast(
-              i18n.CLOSED_CASES(resultCount, resultCount === 1 ? firstTitle : ''),
-              dispatchToaster
-            );
-          }
+          const messageArgs = {
+            totalCases: resultCount,
+            caseTitle: resultCount === 1 ? firstTitle : '',
+          };
+          const message =
+            resultCount && patchResponse[0].status === 'open'
+              ? i18n.REOPENED_CASES(messageArgs)
+              : i18n.CLOSED_CASES(messageArgs);
+
+          displaySuccessToast(message, dispatchToaster);
         }
       } catch (error) {
         if (!cancel) {
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx
index 59e55bd24917d..87a446c45d891 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx
@@ -41,8 +41,8 @@ const MyFlexGroup = styled(EuiFlexGroup)`
 const renderUsers = (
   users: ElasticUser[],
   handleSendEmail: (emailAddress: string | undefined | null) => void
-) => {
-  return users.map(({ fullName, username, email }, key) => (
+) =>
+  users.map(({ fullName, username, email }, key) => (
     <MyFlexGroup key={key} justifyContent="spaceBetween">
       <EuiFlexItem grow={false}>
         <EuiFlexGroup gutterSize="xs">
@@ -66,12 +66,11 @@ const renderUsers = (
           onClick={handleSendEmail.bind(null, email)}
           iconType="email"
           aria-label="email"
-          isDisabled={!email}
+          isDisabled={email == null}
         />
       </EuiFlexItem>
     </MyFlexGroup>
   ));
-};
 
 export const UserList = React.memo(({ email, headline, loading, users }: UserListProps) => {
   const handleSendEmail = useCallback(