If you use GC Articles with the optional GC Notify and GC Lists integrations you can collect readers emails to a safe GC Lists database, for use later. Allowing you to write a template in GC Notify to send to the emails you have collected.
To do this you need to talk to the team at GC Articles and use the subscribe block like the ones below. (Note: they aren’t connected and will just give you an error)
You can put subscribe blocks all over your site that all connect to the same list, or have a number of different blocks that correspond to different lists. Most often you will want to use at least two lists. One for English and one for French.