Does anyone have replacement recommendations ... (Score 1)

Vaporware, yes. But I'm working on it.

https://github.com/scholarly/kbsum/wiki/Anonymous-Private-Communications-Service

Unlike others, I don't consider convenience and server-side searching essential features. I consider them fatal features. The only place a message should ever be decrypted is on a computer the recipient physically controls and knows and trusts the administrator.

I am open to suggestions, reviews, criticism, and help.