Cloud Email Server enables you to scale your marketing needs without getting worried. You can as many emails you want. You dont have to worry about server resources. But this is not the case with all the providers. Some cloud email server providers sell email marketing accounts by saying cloud email solution and some providers sell vps servers as cloud smtp servers. Both can work for you but you need to make sure the solution is scale able if you need more resources you can have it without getting worried of server transfer IP changes etc…
Some of the cloud email server providers are