I use Mozilla Thunderbird for my email, and I see the header on every email.
These are all coming from electronicsdesign.com and hovering over the links in each points to pentondes.com, the website for Penton Publishing, or the Electronic Design website. All the article links and even the Facebook, Twitter & LinkedIn links go to pentondes.com
Keithkyll, I went to the Penton Manage Subscriptions website and unsubscribed yesterday morning.
I have gone to my mail server website and blocked the address, at least that stopped them.