Do not send emails to role-based email addresses such as admin@, orders@, payments@, press@, sales@, support@, webmaster@, etc. Role-based emails require the recipient to confirm the subscription before they are able to receive your message. They most likely won't open it to confirm. Role-based emails also generate a lot of spam complaints because these types of email addresses are usually found on websites (generally on the "Contact Us" page of a site), therefore, are most commonly found on scraped/harvested email lists. Essentially, these lists are built by just grabbing the role-based email addresses from various websites, which is not an approved method for gathering subscribers.