If I have an existing list for a basic email newsletter, can I add those names/emails to my substack subscription list, or do people have to individually subscribe?
If I have an existing list for a basic email newsletter, can I add those names/emails to my substack subscription list, or do people have to individually subscribe?
If I have an existing list for a basic email newsletter, can I add those names/emails to my substack subscription list, or do people have to individually subscribe?