[kwlug disc.] 550-postmaster verification failed

[Chris Bruner]

I'm getting this error when I send mail to a list at sourceforge, my isp believes that sourceforge is rejecting my email message but they don't know why. Does anyone here have a clue?

Chris

This is the Spam Firewall at fish2.hurontel.on.ca.

I'm sorry to inform you that the message below could not be delivered.
When delivery was attempted, the following error was returned.


<gumstix-users at lists.sourceforge.net>: host mail.sourceforge.net[66.35.250.206]
    said: 550-Postmaster verification failed while checking
    <cbruner at quadro.net> 550-Called:   216.46.140.5 550-Sent:     RCPT
    TO:<postmaster at quadro.net> 550-Response: 550 <postmaster at quadro.net>:
    Recipient address rejected: <postmaster at quadro.net>: Recipient address
    rejected: User unknown in virtual alias table 550-Several RFCs state that
    you are required to have a postmaster 550-mailbox for each mail domain.
    This host does not accept mail 550-from domains whose servers reject the
    postmaster address. 550 Sender verify failed (in reply to RCPT TO command)