user mailing list not workung / unable to subscribe / mailbox not found

As desribet on the piler homepage, I sent an empty email to piler-user+subscribe@list.acts.hu

Unfortunately, I get allways following error message:

This is the mail system at host duckburg.kiewel-online.name.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<piler-user+subscribe@list.acts.hu>: host mail.acts.hu[45.63.106.21] said: 550
    5.1.1 <piler-user+subscribe@list.acts.hu>: Recipient address rejected: User
    unknown in virtual mailbox table (in reply to RCPT TO command)

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