Email provider with unlimited addresses?

As another answer has already written, there is absolutely:

While most mail providers count the point (.) with the name of an address, it is ignored by Google and can be used arbitrarily. So if you have a point in your own Gmail address, you can leave it quietly. Who has no one can put one or more. This results in the fact that one can practically
endless many addresses from just a single Gmail address. […]

But not only the point goes through as a Joker sign at Google, but there is another, yet clever sign: The plus (+). All that comes behind the plus is ignored by Google’s servers and also has no influence on the recipient. So you can put the plus right behind the name and add any word.

https://www.googlewatchblog.de/2017/08/tipp-so-e-mail/ (source)

I used to categorize sometimes.

LG Lexicon robot, with nice feedback I am happy to be happy at any time.