Thank you for bringing this to our attention! We always suggest first checking your spam or Promotions folder if they are a Gmail address. Contacts successfully receiving your emails is definitely important. We would be happy to look into this further for you if your contacts are unable to find your email in either of these folders! Please email us at social_support(at)constantcontact(dot)com with your username, campaign name, email addresses of these contacts and a reference to this post. We also have Deliverability Specialists that can help look further into these contacts or email campaign.