for added security, you have to solve a captcha now, when creating an account. some clients might not be able to display the captchas. try a different client then.
unused accounts will be deleted after 30 days. you need to create a new one if that happens to you. if you are going on holiday and wont be able to use your account for a while, please contact me in advance.
please encrypt your messages via OTR or even better OMEMO, which also supports sending encrypted messages to offline contacts
This is the darknet xmpp server - feel free to register yourself an account. Client recommendations android: conversations linux: gajim ios: chatsecure