# Brevo (formerly Sendinblue) Source: https://catalystgroup.gg/docs/email-delivery/mailer-brevo/ Updated: 2026-10-19 · By Duane Garner Connect CRM-NG SMTP to Brevo with a v3 API key and an authenticated domain, or use Brevo's SMTP relay instead. This guide shows you how to send your WordPress email through Brevo, the service previously called Sendinblue. Brevo suits small and growing sites: it has a free plan with a daily sending limit and no card needed to start. It also covers how to use Brevo's SMTP relay if you prefer SMTP to the API. The **Brevo** mailer sends through Brevo's API with a v3 API key. You also authenticate your domain in Brevo so receivers trust your mail. ## Before you start - A Brevo account (sign up at `https://www.brevo.com/`). New accounts may need to finish a short profile and activation check before sending. - A domain you control, with access to its DNS records. - Administrator access to your WordPress site. ## Step 1: Add and authenticate your domain 1. Sign in to Brevo Go to `https://app.brevo.com/` and sign in. 2. Open the domains page Open the account menu (your name, top right) and choose **Senders, Domains & Dedicated IPs**, then the **Domains** tab. 3. Add your domain Choose **Add a domain**, enter it, and pick the option to authenticate it yourself by adding DNS records. 4. Publish the records Brevo lists a Brevo code (TXT), a DKIM record and a DMARC suggestion. Add them at your DNS provider exactly as shown. 5. Authenticate Return to Brevo and press the button to check the records. The domain should show as authenticated. 6. Add a sender On the **Senders** tab, add the address you will send from, for example `hello@yourdomain.com`. See [Adding DNS records](https://catalystgroup.gg/docs/email-delivery/dns-records/) for help with DNS. ## Step 2: Create a v3 API key 1. Open SMTP & API In the account menu, choose **SMTP & API**, then the **API Keys** tab (the direct address is `https://app.brevo.com/settings/keys/api`). 2. Generate a key Choose **Generate a new API key**, name it after your site, and create it. 3. Copy it Brevo shows the full key once. Copy it now. > **Authorised IPs:** Brevo can refuse API calls from IP addresses it does not know. If you turn on this protection (look for **Authorised IPs** under the account's security settings), add your web server's IP address there, or sending will fail. ## Step 3: Connect in CRM-NG SMTP 1. Choose the mailer In WordPress, open **CRM-NG SMTP → Settings → General** and set **Mailer** to **Brevo**. 2. Paste the key Paste the key into **API Key**. 3. Enter the sending domain Type the domain you authenticated into **Sending Domain**, for example `yourdomain.com`. CRM-NG SMTP uses it for the domain check after a test email. 4. Set the sender Set **From Email** to the sender address you added in Brevo and set **From Name**. Tick **Force From Email** if other plugins change the sender. 5. Save Press **Save Settings**. ## SMTP You can send through Brevo's SMTP relay with the **Other SMTP** mailer instead of the API. This helps when your host blocks outgoing API calls but allows SMTP, or when you want one set of SMTP details for several tools. 1. Find your SMTP details In Brevo, open **SMTP & API** and the **SMTP** tab. Note the server (`smtp-relay.brevo.com`), the port (587) and your **login**, which looks like an email address and is different from your account email. 2. Generate an SMTP key On the same tab, generate a new SMTP key and copy it. This key is the password. It is not your Brevo account password and not the API key. 3. Choose Other SMTP In WordPress, open **CRM-NG SMTP → Settings → General** and set **Mailer** to **Other SMTP**. 4. Enter the server Set **SMTP Host** to `smtp-relay.brevo.com`, **Encryption** to **TLS**, and **SMTP Port** to `587`. 5. Sign in Turn on **Authentication**, put your Brevo login in **SMTP Username** and the SMTP key in **SMTP Password**. 6. Save Press **Save Settings**. Brevo may need to activate SMTP on your account before the relay accepts mail. More about the fields: [Other SMTP](https://catalystgroup.gg/docs/email-delivery/mailer-other-smtp/). ## Send a test email Open **CRM-NG SMTP → Tools → Email Test**, enter your address in **Send To**, and press **Send Email**. You can also find the message under transactional logs in Brevo. See [Sending a test email](https://catalystgroup.gg/docs/email-delivery/send-a-test-email/). The test page's domain check looks for `sendinblue.com` in your SPF record. Brevo's current setup relies mainly on DKIM and DMARC, so follow the records Brevo shows you; a warning about SPF alone does not mean sending is broken. ## Troubleshooting - Brevo has not verified the account, or your server's IP is not authorised: [Unauthorized: not verified or IP not authorized](https://catalystgroup.gg/docs/email-delivery/error-brevo-unauthorized/) - The API key is wrong or deleted: [Unauthorized: key not found](https://catalystgroup.gg/docs/email-delivery/error-unauthorized-key-not-found/) - The SMTP relay is not switched on yet: [SMTP account not activated](https://catalystgroup.gg/docs/email-delivery/error-smtp-account-not-activated/) - Brevo suspended the account: [Account blocked](https://catalystgroup.gg/docs/email-delivery/error-account-blocked/) - The daily limit is used up: [Email sending limit reached](https://catalystgroup.gg/docs/email-delivery/error-email-sending-limit/) - SMTP sign-in fails: [535 Authentication failed](https://catalystgroup.gg/docs/email-delivery/error-535-authentication-failed/) - Mail arrives in spam: [Emails landing in spam](https://catalystgroup.gg/docs/email-delivery/emails-landing-in-spam/) ## Related - [Choosing a mail service](https://catalystgroup.gg/docs/email-delivery/choose-a-mailer/) - [Other SMTP](https://catalystgroup.gg/docs/email-delivery/mailer-other-smtp/) - [Adding DNS records: SPF, DKIM and DMARC](https://catalystgroup.gg/docs/email-delivery/dns-records/) - [Delivery and bounce webhooks](https://catalystgroup.gg/docs/email-delivery/delivery-webhooks/) - [Sender name, address and the Force settings](https://catalystgroup.gg/docs/email-delivery/sender-name-and-address/)