diff -urN mailx-12.5.old/names.c mailx-12.5/names.c
--- mailx-12.5.old/names.c	2006-03-04 01:32:16.000000000 +0100
+++ mailx-12.5/names.c	2020-12-25 11:49:29.656778902 +0100
@@ -572,7 +572,7 @@
 	/*LINTED*/
 	top = (char **)salloc((t + extra) * sizeof *top);
 	ap = top;
-	*ap++ = "send-mail";
+	*ap++ = "sendmail";
 	*ap++ = "-i";
 	if (metoo)
 		*ap++ = "-m";