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SMTP Relay (Brevo)

Messages and Calendars send emails through Brevo's free SMTP relay (300 emails/day).

Sign Up

  1. Go to brevo.com and create a free account
  2. Navigate to SMTP & API in the dashboard
  3. Note your SMTP server, port, login, and generate an SMTP key

Credentials

You'll need these values for the .env files:

Setting Value
SMTP Host smtp-relay.brevo.com
SMTP Port 587
SMTP Username Your Brevo login email
SMTP Password Your Brevo SMTP key (starts with xsmtpsib-)

Domain Verification

Brevo requires verifying your sending domain:

  1. In Brevo dashboard, go to Senders & IPs → Domains
  2. Add <domain>
  3. Brevo will give you DNS records to add (DKIM + return path)
  4. Add those records at your registrar
  5. Wait for verification (can take a few hours)

Without domain verification, emails may land in spam or be rejected.

Usage

Both Messages and Calendars send through Brevo:

  • Messages: MTA-out → Brevo (outbound emails from mailboxes)
  • Calendars: Backend → Brevo (event invitations, RSVP replies)
  • Messages API: Calendars → Messages API → Brevo (invitations sent from mailbox identity)