There's one big misconception here which really tears down the entire analogy from the beginning: you don't really choose your email server, and you were never intended to.<p>When email was developed, your email address would have been comprised of the computer you used (email is quite old) and your account name on said computer. As computers proliferated, the "computer" instead becomes "institution providing you with internet access", which would be your employer or your university (if a student), or your ISP if you manage to get home internet access. The email address is thus fundamentally tied to your source of internet [1], which also made it a useful unique identifier for the Web. But the desire for stability of this across ISP changes, as well as the need for multiple email accounts for a single household (kids don't want to use their parents' email address), propels the need for webhosted email accounts, email identities not specifically tied to your source of internet. And these email providers should be seen as exceptions to the general rule that email comes from your internet provider (although they probably provide the majority of email addresses now).<p>So the decentralization of email doesn't really create a "what server do I choose?" question, because the server is already chosen for you. And to the extent that the question does come up (when choosing a personal, permanent email provider), the evidence from the field is that the vast, vast, <i>vast</i> majority of people settle down for very few providers for this question (Gmail is close to a majority of personal email accounts, if not already there). From a <i>user's</i> perspective, email is not decentralized, and the confusion that Mastodon's decentralization brings isn't really an issue in email.<p>[1] And if you look up the version of email that was actually properly designed from the ground up as email (X.400), rather than accreting over time as SMTP et al did, it's even more apparent that email addresses are intended to come from your source of internet.