Option to send a confirmation e-mail automatically (or trigger welcome emails already set up) when new e-mails are imported or manually added to a list. Having to ask them to resubscribe from scratch almost immediately after they already opted in (or potentially double opted-in) from a program MailPoet isn't integrated with just because we can't send a confirmation email is very much not ideal. Having to use the current workaround (import them into a list and send a newsletter manually before then manually moving them to the original list we want them on) is an incredibly time-consuming task that has to be repeated constantly as new subscribers sign up for the list with whatever program you're using that MailPoet doesn't integrate with (e.g. kingsumo, bookfunnel).