diff --git a/CMakeLists.txt b/CMakeLists.txt
index c856178..61a2633 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 include(FetchContent)
 
 # Option to use mailio-based IMAP (OFF by default to avoid Boost dependency issues)
-option(USE_MAILIO_IMAP "Use mailio-based IMAP synchronizer (requires Boost)" ON)
+option(USE_MAILIO_IMAP "Use mailio-based IMAP synchronizer (requires Boost)" OFF)
 
 if (USE_MAILIO_IMAP)
     # Use pre-built mailio and Boost from thirdparty/