[sharpos-board] Undelivered Mail Returned to Sender

[<MAI...@ha...>]

This is the Postfix program at host hapkido.dreamhost.com.

I'm sorry to have to inform you that your message could not be
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

<sha...@li...>: host
    mail.sourceforge.net[66.35.250.206] said: 451-Could not complete sender
    verify callout 451-Could not complete sender verify callout for
    451-<sha...@li...>. 451-The mail server(s) for the
    domain may be temporarily unreachable, or 451-they may be permanently
    unreachable from this server. In the latter case, 451-you need to change
    the address or create an MX record for its domain 451-if it is supposed to
    be generally accessible from the Internet. 451 Talk to your mail
    administrator for details. (in reply to RCPT TO command)