I use the Thunderbird add ons "mail merge" and "send later" to create mass mailings with individual salutations etc. Now I also want to send an automatic follow-up to these mailings. However, only to the people who didn't answer to the first mailing should receive a follow-up. Is it possible to automatize this process with Thunderbird? Or is there maybe an add on I can use for that? Right now I have to check every mail individually for replies and answer one after another by hand. That takes a lot of time and there has to be a solution for that. Can you guys help me with that? Thank you so much in advance!