A newsletter is a kind of campaign that people subscribe to and receive regularly. A mailing list is the list of addresses a campaign goes to. HawkOpen campaigns are meant for personal emails to people you already work with, sent from your own Gmail, Outlook or IMAP/SMTP mailbox; HawkOpen is not a newsletter platform with sign-up forms and subscriber management.
Every plan includes campaigns. One campaign can have up to 50 recipients on Free and 500 on Pro and Business, and every copy ends with a “Do not send me messages” line and carries a one-click unsubscribe header. Replies are recorded when HawkOpen can read your mailbox. Opens and clicks are shown per person with their classification, but only for recipients who are tracked: tracking needs your company’s switch and the recipient’s recorded consent, and everyone else gets an ordinary copy.