Cloze will only create contacts automatically for real people - so you won't see contacts automatically created for newsletters, social updates, mass marketing emails or for email accounts that are generic like "support@company.com" or "sales@company.com".

However, if you do want to create a contact for one of these types of email accounts, you can use the "whitelist" option to create a Cloze contact from the bulk sender. This can be helpful if you have a contact that uses a generic email address as their personal or work email.