The flow is sending the same message/image twice to me

I'm not running my own mail server, it's from simply.com.

I can get 4 messages, but it's 4 unique images, and then next time the flow is running, I get the 4 same images again for the 2. time.

But I have now added this "old" duplicate/deduplicate node, and its working 100%
Now I still get two image of each message/mail, but the duplicated message is stopped with node-red-contrib-deduplicate (node) - Node-RED (nodered.org) I have added it after my function node.

I can remember that I had some issuse with the "email" node:
How to send purge message with node-red-node-email - General - Node-RED Forum (nodered.org)

And then suddenly a few days later, the node was updated and then it worked.
So I think that this issue is also due to an error in the "Email" node and that it is probably currently only I have experienced it.