Because role-based and reserved email addresses often represent multiple recipients, they generate many spam complaints. To prevent unnecessary spam complaints, Pardot restricts these email addresses on imports and doesn’t send email to reserved email addresses.
Role-based email addresses are typically company addresses (like admin@, support@, sales@, no-reply@, sales@) that are not associated with a particular person, but rather with a company, department, position or group of recipients. They are often managed by several people or eventually fall into disuse. Some of these types of addresses are associated with high bounce rates and spam complaints, so Gist blocks them from your import. Role-based email addresses also cannot be used to sign up for a Gist account.
Addresses with the following prefixes are role based. Importing and sending to these email addresses is disabled by default. If you have a legitimate business reason to import role-based email addresses, contact support.