rel=nofollow on external links
Upon request, I've made a small patch that adds rel=nofollow on absolute links.
The patch is also available here: http://github.com/dennis/redmine/tree/nofollow-links
Updated by Go MAEDA about 4 years ago
I delete many issues and forum messages made by spammer every day at www.redmine.org. Adding "rel=nofollow" to user-generated content (untrusted content) may prevent spammers from abusing Redmine. Google recommends using "nofollow" in order to prevent comment spam.
GitHub and GitLab add "nofollow" to external links.