I’m not ready to drop reddit entirely and to create accounts there I need an email address. I don’t want to disclose my phone number or any other personal information.
I tried i2p, but for whatever reason, mail from reddit doesn’t get its way to the inbox.
What other providers could I use?
While not directly answering your question, you can create a reddit account with only a username (no email). You have to use old.reddit.com, click sign up and then when it prompts for an email just hit next. It should let you sign up with just a username and password.