Alejandro Mery:

package/base/sendmail/setmailer.sh

@@ -5,5 +5,9 @@ for x in sendmail mailq newaliases; do
 	echo -e "#!/bin/sh\nexec -a $x ${x}_@mailer@ \"\$@\"" > /usr/bin/$x
 	chmod +x /usr/bin/$x
 done
+
+# add compatibility symlink
+ln -sf /usr/bin/sendmail /usr/sbin/sendmail
+
 exit 0