Yep it's legit... unless there's someone else out there promoting our forum. (which would be great anyway)
If you want to unsubscribe, just go to your User CP - then to Edit Options and deselect the "Receive Email from Administrators" checkbox and then click Save Changes. You'll then be off the mailing list.
Cheers
Clancy
"Even if you're on the right track, you'll get run over if you just sit there.". Will Rogers