Gmail is the only thing I wouldn't be able to replace.

I've read it's almost impossible to run your own email server without getting blocked by all recipients in 2025.

I don't self-host everything. For example, I use Fastmail with custom domains. I think this spreads the risk.

Unfortunately, Google has a policy of "greylisting" domains it had not yet seen, so this increases friction with people on Google. I'm not even running my own email server :(

I'm running my email server on some famous VPS provider, and with properly configured server (SPF, DCIM), I didn't really get any problems sending emails.