The other freelancer was not going against the rules.
Prior to establishing a contract, a freelancer may provide an email address if doing so is necessary to provide access to resources that need to be reviewed. The freelancer needs to make it clear that no communications should be conducted using the email address.
The June 26 policy announcement contains this addendum:
"Users may share email addresses for the sole purpose of providing access to a system that contains information about the project. If the system can be accessed without sharing an email address (such as via a link), it should be shared that way."