Confidential data should be transferred to and from Jonas Ranstam with maintained integrity of the data. Ordinary email is generally not a good choice.
Use this secure uploading system instead.
However, as long as the information is encrypted, data sets and documents can also be sent via email. GPG provides reliable encryption. The public key for firstname.lastname@example.org can be found here. Protonmail offers a reliable and convenient solution to automatic encryption with GPG. The email addresses email@example.com and firstname.lastname@example.org can be used for this purpose.