IEEE, and also ACM. I'm pretty sure both vendors has ~10 different magazines covering different subtopics. We get copies of Communications of the ACM delivered here.
The way I think I want digital subscriptions to work is that I can read them instantly on any device with one click and without stupid tracking links, login/paywalls, etc..
Alternately I'd probably be OK with an email with a simple, non-tracking link to the PDF.