Up your alley ping
1) The IP channels to this email host were not secure.
2) The server itself was not secure.
Just item 1 is enough to compromise any and all transmissions, since the right spyware at the ISPs hub could sniff and copy every packet sent in real-time to a separate location for storage. The NSA uses this already, with the ISPs complicity; foreign actors would have to sneak this in, and do.
Her server was no doubt completely unsecure. She was using it so transact bribes from foreign donors.