See post #6 above.I've been getting these newsletters also from Drum Forum <[email protected]>.
Good practice not to click on anything in a suspected email, so I reported it to GMail (my mail client) then marked as spam.
If it's helpful to our webmaster/moderators, I was able to decipher that they are coming from "mail.enthuseddigital.com/sendy/.."
Something else we might try is to block emails from that server.
Hope this is helpful.