[Serusers] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the Postfix program at host www.mobile-ip.de.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

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 message returned below.

			The Postfix program

<sean.figgins at iptel.org>: host fox.iptel.org[195.37.77.101] said: 550
    <sean.figgins at iptel.org>: User unknown in virtual alias table
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