Index: src/email.c
==================================================================
--- src/email.c
+++ src/email.c
@@ -177,10 +177,17 @@
     k = translateBase64(blob_buffer(pMsg)+i, i+54<n ? 54 : n-i, zBuf);
     blob_append(pOut, zBuf, k);
     blob_append(pOut, "\r\n", 2);
   }
 }
+
+#if defined(_WIN32) || defined(WIN32)
+# undef popen
+# define popen _popen
+# undef pclose
+# define pclose _pclose
+#endif
 
 /*
 ** Send an email message using whatever sending mechanism is configured
 ** by these settings:
 **