Casac says it has seen evidence of decision making that shows Busisiwe Mkhwebane tried to protect officials.
Experts believe Abrahams will pursue the charges against Zuma.
The Constitutional Court is expected to hear that Nxasana should be reinstated.
Shaun Abrahams has decided whether or not to prosecute Zuma, and will announce his decision by mid-March.
The ANC says civil society organisations have been invited to the its policy conference . . . but we can't find them.
But experts have warned that the contents of the emails, not their source, should be investigated.
The NGO Casac is attempting to force the president's hand over approving the Financial Intelligence Centre Amendment bill.
Casac says it will go to court if Zuma does not sign the bill soon.