Hello,
thank you for the super-fast reply. I totally agree that deleting subscribers after a defined time is not a good idea, that's why I'd like to ask them to reconfirm/prolong their subscription. What you suggest probably won't work for me. The newsletters I'll be sending out will contain mostly (maybe only) invitations to concerts. There is no need for the recipient of the newsletter to click anything in the email - if he's interested, he'll just come. Therefore, I'll probably have most of my subscribers inactive as seen by the plugin but still coming to the concerts and wanting to receive the emails.
In fact, I have also subscribed to a number of newsletters from different companies where I get it, read it but do not click anything in it.
I hope I expressed myself clearly 🙂
Thank you.