An email server used by only one sender. A dedicated server often costs more to use because the expense can’t be spread among many users, but it performs better than a shared server. Email usually goes out faster, the server is more secure, and you eliminate the possibility that another sender could get the server blacklisted for spamming.
Whether you choose to do your marketing online or offline, one thing does not change. This is the concept that no single marketing strategy will be as effective as a combination of two or more marketing strategies.