Regularly! If you have a large list (Greater Than 10,000), we suggest checking the list for validation every 2 weeks. Smaller lists can be checked monthly. If your business relies on email lists for its marketing, it's important that you keep the lists current and "clean" to maximize your target potential and reduce the overheads associated with managing too many "bounced" emails. Email addresses are always changing so you need to make sure you have the right email address to avoid wasting your time and resources. Start checking your email lists with BulkEmailVerifier.com now!