If you run your own mail server, it's hard to get email deliverability to the inboxes of people who use the Big 3 (Gmail, yahoo mail, Outlook.com). This makes using these privacy-invasive email services a much easier decision

Problems seem more to do with the age of the domain, rather than the size.

So you are one of those sites that reject email addresses with "+" in it?

I've found that Google's Messenger app[0] is a nice, no-frills SMS app (not to be confused with Google's other messaging apps, or any of the other apps called "Messenger")

[0] https://play.google.com/store/apps/details?id=com.google.and...