[Tulungan] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the Postfix program at host smtp-out-02.comm2000.it.

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 Postfix program

<mail.sittam.itrussia at mail.sittam.it>: host mx.sittam.it[89.186.73.42] said:
    550 5.1.1 <mail.sittam.itrussia at mail.sittam.it>: Recipient address
    rejected: User unknown in virtual mailbox table (in reply to RCPT TO
    command)
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