--- src/spam.c.orig	2016-04-02 20:24:15.000000000 +0100
+++ src/spam.c	2016-04-21 16:42:49.297221000 +0100
@@ -494,7 +494,9 @@
 (void)fclose(mbox_file);
 
 /* we're done sending, close socket for writing */
-shutdown(spamd_sock,SHUT_WR);
+if (!sd->is_rspamd) {
+  shutdown(spamd_sock,SHUT_WR);
+}
 
 /* read spamd response using what's left of the timeout.  */
 memset(spamd_buffer, 0, sizeof(spamd_buffer));