Just a reminder any email you have online that is over six months old can be read without a warrant.
Hm, I have 10 years worth of emails in my dovecot, on my metal, in my basement, online. Can you please describe how can it be read without a warrant by people who don't have my imap password or wheel ssh key to my server?
I just checked on my mail (look at headers, for smtp hosts not just senders and receivers).
For me its 76% for the past 7 years, that either originated or ended in one of the big three silos.