I have a lead magnet pdf I want to send to people that come to my website and enter their email. I want to collect emails in case I ever start sending bulk emails to people on the list. I would probably send less than 6 emails per year. I don't mind getting an address from Viabox to comply with laws. Is there a service that automates what I'm looking for that also handles unsubscribes, duplicate emails, and has good customer support? Also, can email lists be transferred to different services if ...