How to DISABLE automatically making a message as read in Mail

"updating the website from work"
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SquidlyMan figures out his own issue.

Ok…I take part of what I said back. It was MailActOn by InDev which allowed me to not automatically have a message marked as read.  See for more info.

Apparently the version I had loaded wasn’t compatible with Lion  Since updating it, I know have this feature again.