Brevo (Sendinblue) SMTP Setup: Free 300/day Forever (2026 Guide)
300 emails/day free forever. Marketing + transactional + chat in one.
TL;DR
- check_circleBrevo SMTP server: smtp-relay.brevo.com — port 587 (STARTTLS) or 465 (SSL/TLS).
- check_circleUsername looks like 7xxxxx@smtp-brevo.com — you'll find it inside the SMTP & API settings.
- check_circlePassword is your SMTP master key (separate from API key).
- check_circleFree tier: 300 emails/day, forever, no credit card required. Unlimited contacts.
- check_circleSender addresses must be added under "Senders, Domains & Dedicated IPs" before they can be used.
Connection settings
smtp-relay.brevo.com587STARTTLSYour Brevo SMTP login (e.g. 7abcde@smtp-brevo.com)Your Brevo SMTP master password / keyWhat you'll need
A Brevo account
Sign up at brevo.com (formerly Sendinblue). Free tier is generous and doesn't require a credit card.
Sign up for Brevoopen_in_newAt least one verified sender
Brevo won't deliver from arbitrary addresses. Add the sender email and confirm via the verification link, OR add and authenticate a whole domain.
Step-by-step setup
- 1
Sign up and confirm your email
Register at brevo.com. Verify the address Brevo emails you. Brevo asks a few onboarding questions about your business — you can skip them.
Registeropen_in_new - 2
Add a sender address
Dashboard → top-right menu → Senders, Domains & Dedicated IPs → Senders → Add Sender. Enter the From email + name. Brevo emails the address with a confirmation link — click it.
Manage sendersopen_in_newlightbulbTip: For better deliverability, authenticate the full domain instead (next step).
- 3
(Recommended) Authenticate your domain
Senders, Domains & Dedicated IPs → Domains → Add Domain → enter yourdomain.com. Brevo generates SPF, DKIM, and Brevo-code TXT records. Add them at your DNS provider and click Verify.
Authenticate a domainopen_in_new - 4
Open SMTP & API settings
Top-right user menu → SMTP & API. Switch to the SMTP tab. You'll see your SMTP server, login (looks like 7abcde@smtp-brevo.com), and master password.
Open SMTP settingsopen_in_new - 5
Copy SMTP credentials
Copy the SMTP login string and the master password. The login is unique to your account — it's NOT your email. Treat the password like a key — anyone with both can send through your account.
warningWatch out: Brevo's SMTP password rotates if you regenerate it. Save the value in a secret manager rather than committing it to source.
- 6
Use these SMTP server settings
Host: smtp-relay.brevo.com · Port: 587 STARTTLS or 465 SSL/TLS · Username: 7xxxxx@smtp-brevo.com (yours from step 4) · Password: the SMTP master password.
- 7
Send from an authorized sender
Set the From header to a verified sender or any address on your authenticated domain. Brevo rejects unauthorized senders cleanly with 550 errors.
Connect to CodeOpx Mail
Connect Brevo to CodeOpx Mail:
- 1Add SMTP config
Dashboard → SMTP → "Add config" → choose Brevo (Sendinblue). Host and port pre-fill.
- 2Paste credentials
Username: your unique Brevo SMTP login. Password: the SMTP master password.
- 3Test and save
Click "Test connection." Green check confirms Brevo accepts the handshake.
- 4Send with verified sender
Compose with a From address that's verified inside Brevo. The composer's pre-flight check catches unverified senders before send.
Common errors & fixes
535 Authentication failedWrong SMTP login or password
Most common cause: using your Brevo account email instead of the SMTP-specific login string.
Fix: Open SMTP & API in Brevo. Username is the 7xxxxx@smtp-brevo.com string shown there, NOT your account email. Re-copy the master password.
550 Sender not authorizedFrom address not verified
Brevo won't relay from an unverified sender.
Fix: Add the From address under Senders, Domains & Dedicated IPs → Senders → Add Sender, or authenticate the whole domain.
550 Daily limit reached300/day cap hit
Free tier's rolling 24-hour cap.
Fix: Wait 24 hours from your first send, or upgrade to a paid plan.
421 4.7.0 Too many connectionsBurst rate exceeded
Brevo throttles new accounts aggressively.
Fix: Slow to 5 messages/second on free tier. Pool SMTP connections rather than reconnecting.
Sending limits
Brevo's free tier is the most generous of any major ESP with no time limit. Paid plans focus on volume rather than per-feature pricing.
| Free tier | 300 emails / day, forever |
| Starter plan | From $9/mo for 5,000 emails/mo |
| Business plan | From $18/mo for 5,000 + marketing automation |
| Enterprise plan | Custom volume + dedicated IP |
| Contact storage | Unlimited on all plans (free included) |
| Max message size | 20 MB |
- lightbulbBrevo's free tier includes unlimited contact storage — useful if you'll eventually run newsletters with it.
- lightbulbTheir marketing automation features (Business plan and up) are competitive with Mailchimp's lower tiers.
- lightbulbAdd Brevo's tracking pixel by leaving "Open tracking" on in the SMTP settings, or strip it via the X-Mailin-Tag header.
FAQ
Is Brevo the same as Sendinblue?
add
Yes — Sendinblue rebranded to Brevo in May 2023. The product, pricing, and SMTP endpoint are the same. The new domain is brevo.com; old sendinblue.com URLs redirect.
Why is the SMTP login a weird email-looking string?
add
Brevo issues a unique SMTP routing identifier per account, formatted as a fake-looking email (7abcde@smtp-brevo.com). It's not a real inbox — it's just a unique login token. Don't try to email it.
What's the difference between SMTP login and API key?
add
Brevo has both. SMTP login + master password works for SMTP traffic. API keys (also under SMTP & API) work for HTTP API requests. They're separate credentials; rotating one doesn't affect the other.
Can I send marketing emails through Brevo SMTP?
add
Yes — Brevo is one of the few transactional SMTP providers that explicitly supports marketing newsletters too. They include opt-in lists, unsubscribe management, and CAN-SPAM/GDPR compliance footers automatically.
Does Brevo offer a dedicated IP on the free tier?
add
No — dedicated IPs are an enterprise add-on. Free tier sends from shared Brevo IPs, which are well-warmed but shared with thousands of other senders. Pay for a dedicated IP if you're sending 100k+/mo and your reputation matters.
Why is my Brevo daily quota counting twice for the same recipient?
add
Brevo counts every email envelope toward the daily quota — including To, CC, and BCC. A message to 5 recipients is 5 quota hits, not 1. Plan accordingly.
Video tutorial
Watch: Brevo SMTP setup tutorials on YouTube
We curated a YouTube search of recent walkthroughs by independent creators. The official docs (linked below) remain the source of truth.
play_arrowWatch on YouTubeFurther reading
Related provider guides
Ready to send through brevo?
Sign up for CodeOpx Mail, add this SMTP config, and you'll be sending tracked emails in under 5 minutes.