Use a custom domain
Sending from@yourdomain.openmail.sh improves deliverability vs. shared domains. Configure your domain in the Dashboard and add the provided DNS records (SPF, DKIM).
Suppressions
openmail maintains a suppression list for bounces and spam complaints. Recipients who bounce or mark as spam are automatically suppressed. See Suppressions for details.Rate limits
New inboxes have cold outreach limits. Warm up gradually. See Rate limits for sending limits.Content and behavior
- Avoid spam trigger words and excessive links.
- Include plain text; don’t send HTML-only.
- Honor opt-outs promptly.
- Use consistent “From” names and addresses.