Police in Copenhagen, Denmark's capital, arrested the man, who allegedly tried to sell the emails to the BT
newspaper in Herning, western Denmark.
He faces preliminary charges of illegally obtaining another person's mail, and if found guilty, faces up to 18 months in prison.
BT said it was contacted on Monday by a person offering to sell the contents of Rasmussen's email inbox.
The daily contacted Rasmussen who confirmed it was his mail.