--- title: Managing Contacts & Address Book description: Learn how contact management works in the shared address book, including how to identify unsubscribed users, handle invalid email uploads, and understand organisation‑wide contact visibility. --- [Skip to content](https://support.datapharm.com/knowledge/managing-contacts-address-book#main-content) English Show submenu for translations ![6789782.fs1.hubspotusercontent-na1.nethubfs6789782Product logosDatapharm\_RGB\_Logo1 (3)-4](https://support.datapharm.com/hs-fs/hubfs/social-suggested-images/6789782.fs1.hubspotusercontent-na1.nethubfs6789782Product%20logosDatapharm_RGB_Logo1%20(3)-4.png?width=500&height=115&name=6789782.fs1.hubspotusercontent-na1.nethubfs6789782Product%20logosDatapharm_RGB_Logo1%20(3)-4.png) - [Datapharm homepage](https://www.datapharm.com/) Open main navigation Close main navigation - [Datapharm homepage](https://www.datapharm.com/) - English Show submenu for translations - www.datapharm.com www.datapharm.com Welcome to the emc academy - There are no suggestions because the search field is empty. 1. [emc Academy](https://support.datapharm.com/knowledge?hsLang=en) 2. [emc publisher](https://support.datapharm.com/knowledge/emc-publisher?hsLang=en) 3. [Change broadcast](https://support.datapharm.com/knowledge/emc-publisher?hsLang=en#change-broadcast) # Managing Contacts & Address Book ### How will I know if someone in my address book has unsubscribed? If someone has unsubscribed, the **Opted In** column will show **“No”** next to their name. If you attempt to send them a broadcast, the system will warn you that they will first receive an **opt‑in request**. If preferred, you can delete the contact from your address book instead. ![CB - Consent](https://support.datapharm.com/hs-fs/hubfs/emc%20academy%20images/CB%20-%20Consent.png?width=670&height=300&name=CB%20-%20Consent.png) ### Can I have more than one address book? No. The address book is **shared across your company account**, and all users see the same list of contacts. Any changes you make, adding or deleting a contact, are reflected for everyone. If you delete a contact, it will no longer appear for any user in your company. If you’re interested in having multiple address books, please let us know so we can consider it as a future enhancement. ### What happens if I upload a CSV with invalid email addresses? Invalid email formats are **automatically flagged on screen**. They **won’t be added** to your usable address book until the errors are corrected. You can edit or delete any invalid entries and re‑upload the file as needed. 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