--- exim4-4.86.2.orig/src/spam.c
+++ exim4-4.86.2/src/spam.c
@@ -499,7 +499,10 @@ if (ferror(mbox_file))
 (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));