diff --git a/CMakeLists.txt b/CMakeLists.txt
index 61a2633..4335638 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,7 +21,20 @@ if (USE_MAILIO_IMAP)
     find_package(mailio REQUIRED CONFIG)
 endif()
 
-find_package(Qt6 COMPONENTS Core Gui Widgets Network Sql Test Concurrent REQUIRED)
+# Find OpenSSL for S/MIME support (optional on some platforms)
+find_package(OpenSSL QUIET)
+if (OPENSSL_FOUND)
+    message(STATUS "OpenSSL found: ${OPENSSL_VERSION}")
+    add_compile_definitions(OPENSSL_FOUND)
+else()
+    if (WIN32)
+        message(WARNING "OpenSSL not found - S/MIME support disabled. Install OpenSSL and set OPENSSL_ROOT_DIR to enable.")
+    else()
+        message(WARNING "OpenSSL not found - S/MIME support disabled")
+    endif()
+endif()
+
+find_package(Qt6 COMPONENTS Core Gui Widgets Network Sql Test Concurrent PrintSupport REQUIRED)
 
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)