You can sometimes get them to give you a captcha instead when signing up. Or an email address. Still better than a phone number. Its getting harder and harder to get the captcha though.

posteo.de

$1 a month, small german email service. 1 alias available.

Do they? I have no memory of that, and I just checked my account. There’s nowhere to find/change a phone number.

The email function working fully for nostrplebs.com folks would be cool. Seems like the bare bones is there anyways, but as a user, alot of emails don't actually come through. 😭

Here's another vote for Tuta.com. Been using them for a while (~9 months now) and had a Skiff account, too. No Bitcoin for payments , yet-I bug them every once in a while...