My client told me the following:
He received a private email from "Client A" yesterday.
Today "Client B" contacted him and forwarded him the very same message from Client A because she recieved it in her mailbox, even though it was addressed to my own client only.
So how would client B recieve this email, and what can I do to stop that from happening again? I just ran ccleaner and TDSS killer, and am now running Malwarebytes, and will also run SAS.
Thanks for any insight. I'd like to be able to prevent this in the future.