Hi [name]!
I hope I have contacted the correct person. I was doing some reading on [subject] and came across this page on your site: [link]
On your page there is a link to another external website: [broken link]. When I click on it, the link is broken. I just wanted to let you know about it because other users are probably encountering the same issue.
By chance I saw this [resource] page last week from a business in [location] and I thought it was awesome: [link]. I thought you may want to use it to replace that broken link.
Hope that helps and keep up the good work with the site!
Thank you,
[name]
