When a post is saved, the plugin adds the rel="nofollow" attributes to post external links. The plugin also provides an apt checkbox to exclude a post from plugin's action.

Links which already have a rel attribute are just ignored, so you can set some dofollows are well.

By default, the plugin will only act on posts, no pages or other custom post types. To include (some of) them, use a code like the following, for ex. by putting it in your theme's functions.php:

add_filter( 'rnf_post_types', function( $post_types ) {
    return array( 'post', 'page' ); #specify all desired CPTs, comma-separated
});

1.4 (2020/07/30)

• Tweak: only include posts into plugin action (no pages or CPTs). To include other CPTs, see plugin description.

1.3 (2019/08/29)

• Tweak: considering links as internal if on the same hostname (eg. if WP is installed in www.hostname.com/wordpress, even links pointing to www.hostname.com are internal).
• Fix: now adding rel nofollow even if a (different) rel attribute is already present, preserving it as well.

1.2 (2017/01/09)

• Fix: plugin not ignoring links which already had the rel attribute.
• Tweak: bit of performance improvement.

1.1 (2016/05/21)

• New: adding the nofollow only to external links.
• Tweak: declaring as static some class methods.

1.0

Initial release