Sending the article link is a good move, and/or placing a little note into your email signature should work too.
I also get sidetracked by email, but I can't turn it off because I provide support services for a couple of clients, so being on top of email is part of what I do.
I also can't seem to function properly if I don't clean out my email inbox first thing each morning. It grates on my nerves or something. So, first thing every weekday, about 7am, I start cruising through my and my client-focused inboxes. I clean out all spam first, so I'll have a clue as to what's really waiting for my attention, then I'll answer anything that needs immediate attention, and leave the rest for later in the day when I have less energy.
I don't remember if there's anything specific about this in GTD, but I've seen many recommendations against doing it. i.e. "Don't waste your most productive time on misc paperwork such as email". But it's like having a clean desk for me. I can't concentrate and feel completely in control of things unless it's clean.