I have simply blocked postmaster@itch.io address and marked as spam. I will keep looking at when they introduce a proper system, until then it stays blocked.
They ignore the core issue and always try to blame these "Automatic scripts" or whatever. These folks think it is logical to punish those "script" users.
Guess what, nobody would need any scripts if your stupid bundle system wasn't built around exploiting the purchasers.
We bought a bundle, of course we would want to see the items in our libraries. However I don't remember opting in for those spam e-mails even when putting them to my library manually.
If you check the previous posts about the same issue, they go into radio silence whenever the users say "I have not used a script, I put them to my library one by one".
Ever wondered why people pick Steam or Epic over these third-rate publishing platforms with trash policies when they can? Wonder no more.