Should you create a new Mailchimp audience for every newsletter topic?

For a single brand with shared consent, start with one audience and use groups for topics people choose. Separate audiences are separate contact lists with independent status and billing counts.

If you create one audience for events and one for tips, the same address in both can count twice. An unsubscribe in one audience does not automatically stop marketing in another. Decide what your signup promised before combining data or choosing recipients.

Why can you run out of contacts before you run out of sends?

The Marketing Free plan has separate limits of 250 contacts, 500 sends per month and 250 sends per day. Subscribed, unsubscribed and non-subscribed contacts can all count toward the contact limit. Archived, cleaned and deleted contacts are excluded from that total.

If you have 200 subscribed readers and 60 stored contacts who never subscribed, the 260 contacts can put you over the limit before you send anything. Keep the permission status and check Mailchimp’s rules for archiving inactive records before changing the list.

What should you check before the first campaign?

On paper, match each fictional recipient to the exact permission they gave. Then write the domain and recipient checks you would do before preparing a real campaign.

Separate topics from separate lists
Write that Ava asked for workshop news and Ben asked for product tips. For a workshop email, choose Ava alone. Draw a separate example where Ava appears in two audiences and compare both statuses.
Identify the sender
Write the From address and who controls its domain settings. For a real custom sending domain, follow Mailchimp’s verification and authentication steps. Verification confirms access to the address. Authentication adds domain records the receiving system can check.
Check the stop rule
Cross out Ava if she withdraws permission for the workshop list. Record why she was excluded. Keep it on paper and leave account settings and campaigns untouched.

How do you move contacts without undoing someone’s unsubscribe?

Export contact records and reconcile statuses across the audiences you intend to move. Keep the permission and unsubscribe evidence next to each topic or audience so the new list preserves the same choices.

If the same person was active in one list and opted out in another, pause before merging the records. Work from the stated scope of the opt-out and leave the address out of any group where permission is unclear. Rebuild signup forms and automated flows separately from the contact export.