A friend of mine

is having a three day exhibition of his sculpture, along with another artist who is showing photographs.
Some of the anouncements are being emailed. I happen to get a lot of emails from local galleries who do not supress their recipient lists.
How scummy, if at all, is it to gather these names and include them in *my friend's* email invite?
It seems a little sketchy to me, but then it isn't prawn, or viagra etc.
Just wondering.