one single e-mail adress not working

If you could provide the error/confirmation message you get when you send the form using word@company.com at the To: field of CF7 it would have made it easier for forum members tell what the problem could possibly be.

However you may see Contact Form 7 Email Issues. Links to a comprehensive and detailed article which covers many issues. Most people that work through this information appear to be able to resolve their email sending & receiving issues.

If you find you need more detailed advice, after reading and working through the above links, please include a link to your Contact Form 7 form plus all your input in the Form and Mail sections of the CF7 interface. This should allow others to understand your actual problem and offer a possible solution.