How to Send Emails from Shopify Flow Using Brevo

Go to brevo.com and sign up; no credit card is required for the free plan.

The free plan sends up to 300 emails a day, which is plenty to get FlowRelay connected and tested. Worth knowing: that 300/day is a single pool shared across transactional and marketing email, and free-plan messages carry a small “Sent with Brevo” footer. Paid plans lift the daily cap and remove the branding; check Brevo’s pricing for current tiers before you commit to real volume.

Brevo won’t send from an address until it knows you control it. You have two ways to do this, in the dashboard under Senders, Domains & IPs.

Verify a single sender is the quick start: add the From address you want to use, and Brevo emails it a 6-digit code (or a confirmation link) to enter. Until that’s done, the address can’t be used to send.

Authenticate your domain is the better option for real use: add your domain and the DKIM (and DMARC) records Brevo provides to your DNS host. Once the domain is authenticated, you can send from any address on it without verifying each one individually, and your deliverability improves, which matters since Gmail and Yahoo now expect authenticated sending domains. If you skip this, Brevo will rewrite your From address to a @brevosend.com address to protect delivery (see the common issues below).

In the Brevo dashboard, open the SMTP & API page (under Settings). This page has separate sections for API keys and SMTP, make sure you’re in the right one.

Find the SMTP section and generate your SMTP credentials (the button may read Generate a new SMTP key or Generate SMTP login and master password). Brevo gives you two things: an SMTP login (an email-style username) and an SMTP key (the password). Copy the key somewhere safe immediately, after you leave the page Brevo only shows its last few digits, and if you lose it you’ll have to generate a new one.

To say it once more, because it trips up almost everyone: the SMTP key is what goes in the password field, not the API key from the other section of this page.

Here’s what you’ll enter into FlowRelay:

• Host: smtp-relay.brevo.com
• Port: 587 (STARTTLS) or 465 (SSL); 2525 also works if those are blocked
• Username: your SMTP login from the previous step
• Password: your SMTP key (not the API key)

If you’re migrating an old Sendinblue setup, note the host changed in the rebrand: it’s smtp-relay.brevo.com now, not the old smtp.sendinblue.com. Port 25 is not supported for sending.

Install FlowRelay from the Shopify App Store and accept the requested permissions.

On first launch, FlowRelay shows a short setup checklist: set your sender name and email, connect a provider, and send a test email. The next step covers connecting Brevo over SMTP.

In FlowRelay, open Settings, find Email delivery, and click Manage providers to open the Connect email provider dialog.

Pick SMTP from the provider list and fill in: host smtp-relay.brevo.com, port 587 (or 465), your SMTP login as the username, and your SMTP key as the password. FlowRelay tests the connection before saving it, so using the API key by mistake or a typo in the key shows up immediately rather than after your first real send.

Set the sender address (in FlowRelay’s sender details, or under Override sender) to a sender you verified, or any address on your authenticated domain. Note that your SMTP login is a credential, not a From address, so don’t use it as the sender.

Click Connect. Whichever provider you connect first becomes your Primary, and FlowRelay routes all outbound mail through it. You can connect a second provider later as an automatic Fallback, which is worth doing since the free plan’s daily limit is easy to reach.

Open Shopify Flow, create a new workflow, and pick a trigger (Order created is a common one to start with). Add the Send transactional email action; it shows up in the action list once FlowRelay is installed.

You’ll need to fill in a few fields on the action: an email address for the recipient (this can pull straight from the trigger, like the customer’s email), a subject line, and the body, which is the actual HTML content of the email. There’s also an optional preview text field for the snippet shown in inbox previews. For the body, you can write plain HTML or use Liquid to pull in order details, customer names, and other data from the workflow.

Save the workflow and turn it on.

Before you trust a live trigger, use the Send test email button in FlowRelay’s settings. It confirms Brevo is wired up correctly and shows you where the message lands.

Once that test email arrives, run your Flow workflow under real conditions, like placing a test order, and check FlowRelay’s delivery log to confirm the email went out through Brevo and see its delivery status.