[nicbou]

Gmail let's you add tags to your email like [e-mail]. This is really useful for such purposes.

[diarrhea]

That is true, but is also blocked by many sites. No such thing can happen to a custom domain.

[sportsaw]

Do you have an example of a site that blocks this? I don’t use gmail anymore but used this trick for many years and wasn’t blocked once.

[sgc]

I would have thought most everybody serious about exploiting your data would be rewriting this type of email at this point.