If you're sending lots of email marketing messages from the same domain as your email addresses and these messages get marked as spam or land in the spam box you could affect other employees ability to send emails. If you are not careful with your email marketing practices lots of recipients might designate your email as spam and your corporations domain might get blacklisted. Then, no one will be able to send emails in your company. Consider using a different domain for your email marketing. Make it similar to your primary domain. For example, ourcompany.com could be our-company.com.