diff -urN ../exim-4.95.orig/src/lookups/readsock.c ./src/lookups/readsock.c
--- ../exim-4.95.orig/src/lookups/readsock.c	2021-09-28 11:24:46.000000000 +0300
+++ ./src/lookups/readsock.c	2021-09-30 17:18:06.547305000 +0300
@@ -254,7 +254,8 @@
 if (!cctx->tls_ctx)
 #endif
   {
-  FILE * fp = fdopen(cctx->sock, lf.do_shutdown ? "rb" : "wb");
+//  FILE * fp = fdopen(cctx->sock, lf.do_shutdown ? "rb" : "wb");
+  FILE * fp = fdopen(cctx->sock, "rb");
   ALARM(timeout);
   yield = cat_file(fp, NULL, eol);
   }