I have articles in my blog that are several years old and some of them have links to external content that does not exist anymore. This linked content is usually a link to a news related item or is used as a source to a quote or other information.
What is the best way to handle these dead links?
Obviously if my content is not relevant any more I can delete my content. In most instances this is not the case.
Should I remove the link but add some sort of message or tooltip saying something like "Linked Source Content No Longer Available" to show we once linked to the site.
Also does anyone have any recommendations of a good free link checking software to check the external links found on my site?