_:n5ab28d129318462b90b65574c69fed4cxb4
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.plesk.com/kb/support/unable-to-send-an-email-using-webmail-for-domain-in-plesk-user-unknown-in-virtual-alias-table/>