How to prevent users from modifying their email addresses?

[Rainbow]

I want to prohibit users from modifying their email addresses. What should I do?

[Gene]

If you are running Tinode as a corporate messaging server, then the simplest way is to restrict emails to corporate domain:

https://github.com/tinode/chat/blob/4184ed941080daec1bb6b7804f64fb6a4fc2818d/server/tinode.conf#L415

If that's not your use case then you have to either use plugin or modify the code.