Broken links can happen for many reasons, and it can be frustrating for both the sender and the reader. Sometimes, email services shorten or change links for tracking, and this process can cause errors if the system doesn't handle them well. Other times, security filters or outdated browsers block certain links. Long or complicated URLs can also break when copied or formatted poorly in the email. It's always better to test emails before sending them to your full list. Using short, clean links and checking them on different devices helps prevent problems. What do you think is the best way to test links before sending large campaigns?