How to invite new user to specific server?

8

You don’t actually need the chatmail server QR code. If you

  1. Pretend you have an account on the chatmail server
    a. Make up a 9-character random string, and call it your user name. If your unblocked server was nine.testrun.org, use [9-char random string]@nine.testrun.org as your email address.
    b. Make up a password. A string of 12 random characters is standard.
  2. In the DC client, pick “Create New Profile”>“Use Other Server”>“Classic E-Mail Login”
  3. Fill in your made-up address and password.

Everything works. Except in the unlikely event that that e-mail address already exists, the server will register it on first login.

EDIT: Expanded how-to

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Register a new deltachat email with a bot