I believe some of the items considered to be spam by the mailing system might even not necessarilly end up in Spam folder. Instead, they are just never delivered.
And that's what probably often happens to Indi's newsletters.
I bought TBOL because I was told I could select the rate of the encounters but I never finished it because I like to explore and get annoyed when I have to stop sell of the sudden. I like to see rem kill them then explore fore goodies an secret rooms then go to next area.