Even if you don't see it in the preview mode, subscribers will still get an email with this additional footer. It consists of two parts:
- Text part. You can find the name of the organization, subscriber's profile update link, unsubscription link, subscription reason, and the name of the audience here. The main thing is the unsubscription link. It is the reason why Mailchimp automatically pastes all this text, as by the law if you are not a spammer, the email must contain this link. Or you'll get fined. This is why Mailchimp keeps an eye on it and doesn't let you send a campaign with no unsubscription link. You can remove this part from the footer by just writing the unsubscription link — *|UNSUB|* into any part of the email. If you haven't done it at the beginning, you'll probably have to re-create the email for the changes to take effect.
- Banner. Here it's called Monkey's Reward. And it's Mailchimp's partner banner. Technically, it gives you an opportunity to make more money on your campaign. If your subscriber gets interested in the platform the emails are sent from, they will click this banner. Then they will sign up in Mailchimp, pay for the account and you will get a referral fee. But in practice campaigns don't need this banner as history knows of no people who got rich thanks to this affiliate program. Sadly, you can remove this banner only when you're at least on the Essentials plan. A person with a free account will only be able to change the look of the banner. It can be done in the Account → Extras → Referrals menu. You can also check how much you made there via the affiliate program.