Best Anti Spam Solution How Can I Be Sure That My Company Emails Don't Get Stopped By Spam-filters?

How can i be sure that my company emails don't get stopped by spam-filters? - best anti spam solution

The bypass spam filters to cruel, send Communcations my current employees of the company through my Hotmail account. The problem is that I make by hand, is long. I am doing this because of Hotmail e-mails with 100% penetration, but if the service company, I think a couple of filters to stop e-mails are spam. Any solution?