After this Rudin sent a private email to Pascal stating; "She's seriously out of her mind".
But in exchange for that, Posteo promises users a private email experience.
He said "malicious parties" had hacked into a private email account in December.
It was bad judgment, as she has said, to use a private email server.
Adams has posted his correspondence with Twitter, which claims he published a private email address.
Clinton's use of a private email server while in office has dogged her presidential campaign.
While at the State Department, she secured her online correspondence in a private email infrastructure.
"I made a mistake using a private email," Mrs. Clinton said.
Asked whether he had a private email address, Mr Graham, from South Carolina, replied: "I don't email.
A reference to Hillary Clinton's use of a private email server while secretary of state, it was blocked by Democrats.
This time the smoking gun to emerge was her use of a private email server while at the state department.
