I have two main emails - one for actual correspondence and one for signing up to services and such. I also spin up new emails for trials and such every once in

I have two main emails - one for actual correspondence and one for signing up to services and such. I also spin up new emails for trials and such every once in a while, and delete/abandon them afterwords. I do most of this through ProtonMail. You can't use your own mail client with them without paying, but their webmail is fine enough.