I am setting up a marketing campaign, it starts with an initial introductionary email, and should be followed by a follow up email one week later, but only if the lead did not reply to the first email in the meantime. I thought I can simply check object.message_summary for "Re: Campaign Name", but this does't work.
How can I check if ther has been a reply or not?
Thanks!
More generally in this context you might want to know if 1) the customer opened the email or 2) whether they clicked on any link (i.e. engaged with it). A marketing campaign example that showed this simple working example would be very helpful.