Thank you for your reply. I am testing to see if this is the case, but I am still not sure.
Each card is a separate post with a different ecard id. I pull all these in a page as lightbox, correct. The weird thing is that if I open each post separately, for example this post that contains only one postcard, I still get 5 emails.
The only mail related plugin I have is the contact form 7. Could there be some conflict with this? I will try to disable it and send another test.
This is the page I am having the issue with. If you click on one of the 3 first postcards and send a test, you will probably be able to replicate the issue.
