How to set nofollow for external links in Dokuwiki
Dokuwiki by default doesn't set outgoing links to nofollow, and especially if used as open Wiki, spammers are likely to use the site for their linkbuilding purpose, and the site's PageRank in the process.
Steps
Follow these these steps to disable this feature.
Access the Configuration Manager page
Use the following URL if the link is not available in your template.
http://www.yourwiki.com/doku.php?do=admin&page=config
You will need to log in if you're not already are.
Configure the Use rel="nofollow" on external links setting
Find the option in the Anti-Spam Settings→relnofollow section.
Tick on the checkbox next to the option, and click on the Save button at the end of the page.