fix(Core/Mail): Mailhandler cleanup (#2802)

src/common/Common.h

@@ -132,6 +132,8 @@ inline bool myisfinite(float f) { return isfinite(f) && !isnan(f); }
 
 #define STRINGIZE(a) #a
 
+#define MAX_NETCLIENT_PACKET_SIZE (32767 - 1)               // Client hardcap: int16 with trailing zero space otherwise crash on memory free
+
 enum TimeConstants
 {
     MINUTE          = 60,