Why did I get this message after posting to this forum?

You have attempted to send email to an invalid user at the
adelphia.com
domain. Currently this domain is not used for email. If you are
trying
to reach the email address of an Adelphia powerlink subscriber,
please
send your email to them at adelphia.net.

For more information, please see Adelphia Powerlink's home page at
http://powerlink.adelphia.net

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I received this message via e-mail after posting to this group.
Can some one tell me why?

Donald Brock