Guides
Practical, opinionated guides to sending email that lands — written from running EU sending infrastructure ourselves.
Authenticate your domain, ramp volume gradually, send to people who want your mail, and watch the numbers that decide the inbox. We warm the IPs — you warm your domain.
Field-by-field mapping from Postmark to eusend — send calls, batch, SMTP credentials, and webhook events — plus the honest list of what works differently.
The closest thing to a find-and-replace: SendGrid’s send call already matches eusend’s. Swap the client, remap the Event Webhook, and move your SMTP credentials.
Drop the per-domain endpoints and o:-prefixed options for plain JSON fields — and see what an EU region on a US provider does and doesn’t give you.
Replace SendEmailCommand or the SES SMTP endpoint, then delete the SNS topics, suppression handling, and configuration sets you were running yourself.