I am running the last version e-smith (6.0.1 i think)produced before contribs bought the rights.
contribs did not buy the rights to anything. They were "given custody of" all of the forum posts from the e-smith boards, but they hold those in trust for the community - they aren't "owned" by contribs (and certainly weren't bought). The ownership rights to the software still lies with the various original authors.
I have been having a problem over the last few days where I am getting thousands of returned email to my admin account and they appear to be coming from anonymous@mysite.com.
There's every chance those returned emails have nothing to do with your server - they just happen to be the result of forged spam which happened to use your server's domain name in the from address. But you'd need to examine the full headers of those messages to determine where they have come from and why. I'm sure if you search you'll find good advice on the web as to how to interpret bounced email messages.