When users signup for an account at support.atlassian.com or jira.atlassian.com they get the password sent by email in clear text. This is a security breach, as the email may be intercepted by a third party and used to log in into their accounts. Moreover, many customers will use the same username/password in several systems/applications, so the compromised credentials can give access to other critical systems.

In my opinion, the signup page should have a check box "Send Password Email:" as the Administration window for creating users. That way, users concern about their password being sent over email could have the option of not receiving an email with their passwords.