However, it is not advisable to send to addresses that have not been contacted in a year or more. Many people change their email addresses every year or so and this means that your success rate for that past list could be very low, with several hard bounces. Also, users may have forgotten that they’ve given you permission to email them and mark your campaign as spam. This will negatively affect your account with Benchmark Email and your reputation as a sender. It could even cause you to be blacklisted.