Issue export is a security issue, confidential information is transfered via unencrypted channel (email)
in general exports should not be send via email as attachment (like issue csv export) but as https download link. accessing gitlab/gitlab.com via https allows us to enter "small secrets" in the issue desciption, also it can contain critical information which should not be exposed or transfered via an enuncrypted channel.
it would be good to change (or make it configurable) the issue download from email attachment to download (like the project export)-