Email, Postmark

Postmark is a strong choice for transactional email with best-in-class deliverability and detailed analytics. Pricier than Resend but valuable if email is mission-critical.

Configuration

courier:
  smtp:
    connection_uri: smtps://<server_token>:<server_token>@smtp.postmarkapp.com:465
    from_address: noreply@your-domain.com
    from_name: Your App

Use the same Postmark Server Token as both username and password (Postmark's SMTP auth model).

For Daedalus: choose Postmark in the Email wizard; paste the Server Token.

Server vs Account tokens

Postmark distinguishes:

• Account token, manage the account (don't use for sending).
• Server token, send email from one Postmark server. Use this.

Create the server first in Postmark dashboard, then grab its server token.

Sender signature / DKIM

Verify your sending domain in Postmark before going live:

1. Add domain in Postmark dashboard.
2. Configure DKIM, SPF, Return-Path DNS records.
3. Verify.

Streams: Transactional vs Broadcast

Postmark separates streams. Olympus's email is transactional. Make sure your server's default stream is outbound (transactional), not broadcast (marketing).

Free tier

100 emails/month free for testing. Paid plans start at $15/mo for 10,000.

Where next

• Operate, Email deliverability
• Security, Email verification