Podpage can help you collect email addresses if you don't have a service like Kit, Mailerlite, or any of the MANY email list tools.
Go to Connect > Build a Mailing List if you have people on your list they will be listed there.
You can export the people/emails and import them into your email list tool.
People will only appear on this list after they double-confirm their email.
For more information on email lists in Podpage see