Unable to mail to sysadmin@qt.io

The "Inform us" section of page "https://wiki.qt.io/Mirror_howto" said that "The last thing to do is to inform the Qt Project Sysadmin by email at sysadmin@qt.io to get listed on the mirrors page."
But when I send a mail to sysadmin@qt.io, your mail system said "sysadmin wasn't found at qt.io".
See the attachment.

Best regards.
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Ji WenCong
taiki_akita@163.com