Email is still one of the most successful means of communication on the Internet. But dangers from spam mail, phishing and manipulation often lurk here. Blockchain technology can counteract the whole thing through its security.When emails are sent with the blockchain, a linked QR code is automatically attached there. The QR code gives the recipient of the email the opportunity to view information about the sender and the attachments and thus avoid any viruses. In addition, the dispatch status is recorded, saved and saved in the database. This data contains the information necessary for proof of dispatch and background information on the attachments and e-mail addresses. This procedure could soon completely replace fax and registered mail.