It is possible to publish content to an item by setting up email publishing. If you post an email with a body and optional attachments, a page (body text) or file (attachments with no body text) will be created.
You must send the email from the address you currently have registered with your member details.
If the sender of the email is from an account without create permissions then the content will not be published. In some email clients it is possible to configure alternative "from" addresses. You may need to do this if you are sending from a different account.