diff --git a/__test__/features/Events/EventDisplay.test.tsx b/__test__/features/Events/EventDisplay.test.tsx
index 9ae32d5..28ded30 100644
--- a/__test__/features/Events/EventDisplay.test.tsx
+++ b/__test__/features/Events/EventDisplay.test.tsx
@@ -15,6 +15,7 @@ describe("Event Preview Display", () => {
 
   beforeEach(() => {
     jest.clearAllMocks();
+    (window as any).MAIL_SPA_URL = null;
   });
 
   const preloadedState = {
@@ -63,6 +64,14 @@ describe("Event Preview Display", () => {
                 },
               ],
             },
+            event2: {
+              id: "event2",
+              title: "Test Event",
+              calId: "667037022b752d0026472254/cal1",
+              start: day.toISOString(),
+              end: day.toISOString(),
+              organizer: { cn: "test", cal_address: "test@test.com" },
+            },
           },
         },
         "otherCal/cal": {
@@ -505,6 +514,78 @@ describe("Event Preview Display", () => {
     });
     expect(screen.getByText("Edit Event")).toBeInTheDocument();
   });
+  it("properly render message button when MAIL_SPA_URL is not null and event has attendees", () => {
+    (window as any).MAIL_SPA_URL = "test";
+    renderWithProviders(
+      <EventPreviewModal
+        anchorPosition={{ top: 0, left: 0 }}
+        open={true}
+        onClose={mockOnClose}
+        calId={"667037022b752d0026472254/cal1"}
+        eventId={"event1"}
+      />,
+      preloadedState
+    );
+    expect(screen.getByTestId("EmailIcon")).toBeInTheDocument();
+  });
+  it("doesnt render message button when MAIL_SPA_URL is not null and event has no attendees", () => {
+    (window as any).MAIL_SPA_URL = "test";
+    renderWithProviders(
+      <EventPreviewModal
+        anchorPosition={{ top: 0, left: 0 }}
+        open={true}
+        onClose={mockOnClose}
+        calId={"667037022b752d0026472254/cal1"}
+        eventId={"event2"}
+      />,
+      preloadedState
+    );
+    expect(screen.queryByTestId("EmailIcon")).not.toBeInTheDocument();
+  });
+  it("doesnt render message button when MAIL_SPA_URL is null and event has attendees", () => {
+    renderWithProviders(
+      <EventPreviewModal
+        anchorPosition={{ top: 0, left: 0 }}
+        open={true}
+        onClose={mockOnClose}
+        calId={"667037022b752d0026472254/cal1"}
+        eventId={"event1"}
+      />,
+      preloadedState
+    );
+    expect(screen.queryByTestId("EmailIcon")).not.toBeInTheDocument();
+  });
+  it("message button opens url with attendees as uri and title as subject", () => {
+    (window as any).MAIL_SPA_URL = "test";
+    const mockOpen = jest.fn();
+    window.open = mockOpen;
+
+    renderWithProviders(
+      <EventPreviewModal
+        anchorPosition={{ top: 0, left: 0 }}
+        open={true}
+        onClose={mockOnClose}
+        calId={"667037022b752d0026472254/cal1"}
+        eventId={"event1"}
+      />,
+      preloadedState
+    );
+
+    const emailButton = screen.getByTestId("EmailIcon");
+    expect(emailButton).toBeInTheDocument();
+
+    fireEvent.click(emailButton.closest("button")!);
+
+    const event =
+      preloadedState.calendars.list["667037022b752d0026472254/cal1"].events[
+        "event1"
+      ];
+    const expectedUrl = `test/mailto/?uri=mailto:${event.attendee
+      .map((a) => a.cal_address)
+      .join(",")}?subject=${event.title}`;
+
+    expect(mockOpen).toHaveBeenCalledWith(expectedUrl);
+  });
 });
 
 describe("Event Full Display", () => {
diff --git a/public/.env.example.js b/public/.env.example.js
index 743ac79..6dfa2d2 100644
--- a/public/.env.example.js
+++ b/public/.env.example.js
@@ -6,3 +6,4 @@ var SSO_RESPONSE_TYPE = "code";
 var SSO_CODE_CHALLENGE_METHOD = "S256";
 var SSO_POST_LOGOUT_REDIRECT = "http://example.com?logout=1";
 var CALENDAR_BASE_URL = "https://calendar.example.com";
+var MAIL_SPA_URL = "https://mail.example.com"
diff --git a/src/features/Events/EventDisplayPreview.tsx b/src/features/Events/EventDisplayPreview.tsx
index a70fb77..a37e48c 100644
--- a/src/features/Events/EventDisplayPreview.tsx
+++ b/src/features/Events/EventDisplayPreview.tsx
@@ -20,6 +20,7 @@ import {
   PopoverPosition,
 } from "@mui/material";
 import EditIcon from "@mui/icons-material/Edit";
+import EmailIcon from "@mui/icons-material/Email";
 import DeleteIcon from "@mui/icons-material/Delete";
 import VisibilityIcon from "@mui/icons-material/Visibility";
 import CloseIcon from "@mui/icons-material/Close";
@@ -61,6 +62,7 @@ export default function EventPreviewModal({
   const user = useAppSelector((state) => state.user);
   const [showAllAttendees, setShowAllAttendees] = useState(false);
   const [openFullDisplay, setOpenFullDisplay] = useState(false);
+  const mailSpaUrl = (window as any).MAIL_SPA_URL ?? null;
 
   useEffect(() => {
     if (!event || !calendar) {
@@ -120,6 +122,20 @@ export default function EventPreviewModal({
               gap: 1,
             }}
           >
+            {mailSpaUrl && attendees.length > 0 && (
+              <IconButton
+                size="small"
+                onClick={() =>
+                  window.open(
+                    `${mailSpaUrl}/mailto/?uri=mailto:${event.attendee
+                      .map((a) => a.cal_address)
+                      .join(",")}?subject=${event.title}`
+                  )
+                }
+              >
+                <EmailIcon fontSize="small" />
+              </IconButton>
+            )}
             {user.userData.email !== event.organizer?.cal_address && (
               <IconButton
                 size="small"