> For the complete documentation index, see [llms.txt](https://docs.messageflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.messageflow.com/email/e-mail-campaigns/campaigns/authorization-of-domain-and-senders.md).
# Authorization of domain and senders
Before sending the campaign, you must authorize the shipping domain and add at least one shipping address.
1. After logging in to your account, go to the **E-mai**l tab, then in the menu on the left, select **Common Settings** and go to **Sender Authorization**. Here, select the tab of the tab, which is called **Domain Authorization**.
2. Click **+** to add a new domain.
3. To authorize a domain, follow [our instructions](https://docs.messageflow.com/communication-channels/e-mail/authorization-of-domain-and-senders/authorizing-domains-with-web-hosts/), which include information about authorizing domains with different hosting providers.
4. Complete the domain name, expand Advanced Settings, and check the necessary checkboxes.
4. Click **Next** and go to **DNS** settings.
5. Add the necessary information and click **Verify**.
6. After successful domain verification, go to the **Sender Authorization** tab.
7. Click **+** to add a new sender.
8. Select the appropriate SMTP domain, then enter the sender's address, select the domain, and add the name. Click Save.
Now you can proceed to create a campaign.