If you're attempting to send a campaign to your own email address or a co-worker's email address at the same company, this will often end up in a spam folder, this is usually the case with all 3rd party emailing apps.
Your company's email system may be confused about why you would use a 3rd party emailing server (BuzzBuilder) to email yourself instead of using your company's email server. It's best to add us to your whitelist (also called a Safe Sender List) inside your email account.