diff -ur a/smartd.cpp b/smartd.cpp
--- a/smartd.cpp	2019-07-19 11:50:32.000000000 +0900
+++ b/smartd.cpp	2019-07-19 11:52:53.000000000 +0900
@@ -1149,7 +1149,11 @@
   mail->lastsent=epoch;
 
   // print warning string into message
+#ifdef __APPLE__
+  char message[512];
+#else
   char message[256];
+#endif // __APPLE__
   va_list ap;
   va_start(ap, fmt);
   vsnprintf(message, sizeof(message), fmt, ap);
Only in b: smartd.cpp~