Domains & deliverability

Authentication

Every domain gets DKIM (a cryptographic signature on each email), a custom Return-Path for bounces (which aligns SPF), and a recommended DMARC policy.

Start DMARC gently

Begin with p=none (monitor only). Once all your mail is authenticated, move to p=quarantine, then p=reject.

Protecting your reputation

• Automatic suppression: addresses that hard-bounce or complain are blocked automatically.
• Isolated sending: each account sends in its own isolated environment, so other senders can't affect you.
• Healthy limits: keep bounces under 4% and complaints under 0.08%. The Metrics page shows both.

Tips

• Warm up new domains: start with your most engaged users and increase volume over a couple of weeks.
• Never send to purchased lists.
• Make unsubscribing easy.