Maybe it was added in the meanwhile, but I see Posteo under email. Also, disputable if Posteo is really better, as it highly depend on your requirements. I dismissed it for some reason when choosing and went with mailbox.org, which is also listed.

The information is also not stating that all links are affiliate, just that the site does contain them and some might make them money.

Neurons are used for more tasks than just problem-solving. Dogs have a good smell, so a big part of their brain is probably used for just this. They seem to be also much more acrobatic and reacting faster in general than an Octopus, so theses are probably also areas where additional neurons are used. Dogs have also a high social intelligence, not sure how Octopi are in that regard.

And are Octopi really better at problem-solving than a dog in general?