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 "" or "".

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.