We recently discovered that a few of our older emails (sent in August/september) have links that no longer work. They all lead to 404 pages. The links go to our blog, and the pages have not moved or changed urls - so there should not be an issue.
If I re-send a sample to myself, the links work fine, just not in the original emails.
Do email links expire after a certain length of time?
Thanks for any help!