Imagine you and the other leaders in your organization get an email from your human resources department. It is an offer for free outside consulting time to facilitate some of your project teams. Accepting the offer means chasing down the HR person to get the details, filling out forms, extra meetings, and more people crowding your project than you think you want. It feels like too much pain, but the help will probably be worth it. Nevertheless, I'm guessing you ignore the email.
On the other hand, imagine your HR person stops by your office and makes the same offer, explaining the value and dealing with the obstacles. With this personal approach, you are likely to consider the offer.
If you want results, try the personal approach. One-on-one is usually more effective than dealing with a group. And, face-to-face is better than an email. Don't waste your valuable time sending out an email you wouldn't respond to. As usual, most leadership takes place when you go talk to people.