Email is no longer reliable thanks to the inability of the governments to deal with spammers. More and more, I have to double check with people when I send important emails, because they simply never get them. I even send email to myself, from one email address to another, which never arrives. These emails get dropped by SMTP servers that assume they are spam because you've hit some sort of spam score limit. Reliable email and spam should become an election issue. Let's make it one.