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Returned mail: User unknown

The original message was received at Mon, 18 Oct 1999 08:07:28 -0700 (PDT)
from danmcd@localhost

   ----- The following addresses had permanent fatal errors -----
kent@bbn.com
ipsec@lists.tislabs.com

   ----- Transcript of session follows -----
... while talking to opal.eng.sun.com.:
>>> RCPT To:<ipsec@lists.tislabs.com>
<<< 550 5.7.1 <ipsec@lists.tislabs.com>... Relaying denied. IP name possibly forged [2000::56:a00:20ff:fe8f:cf02]
550 ipsec@lists.tislabs.com... User unknown
>>> RCPT To:<kent@bbn.com>
<<< 550 5.7.1 <kent@bbn.com>... Relaying denied. IP name possibly forged [2000::56:a00:20ff:fe8f:cf02]
550 kent@bbn.com... User unknown
Warning
Could not process part with given Content-Type: message/delivery-status

-- BEGIN included message

> Absent the use of IPsec, how would a user have selected one interface
> vs. another via the usual OS calls (or why would he care)?

I can select an interface for multicast traffic using sockets today.  IPv6's
advanced API also has additional facilities for this.

If I want to send a packet to ff02::1 or 224.0.0.1, I need to know which
interface I'm sending it out.  If I'm multihomed, I'd like to have two SAs
for destination 224.0.0.1 or ff02::1, where each SA is for an individual
link.

Dan

-- END included message