> An unsubscribe command sent to the lne.com administrivia address was > rejected as spam? > > I find that hard to believe, as that is one of the normal commands, > ones which the lne regular message lists.
It's fairly possible the mail was rejected even before the SMTP negotiation itself; it did little problems to me because of HELO string not exactly matching the reverse DNS lookup on the IP. The logs (or the bounce message) have the answer.
