DocsDeliverability ▾
IntroductionQuickstartAuthenticationSending emailDomainsAPI keysSMTP relayWebhooksTemplatesBroadcastsAudiences & contactsSuppression listOpen & click trackingIP warm-upDeliverabilityAnalytics & logsLimits & errorsSelf-hosting & configurationEmailsDomainsAudiences & contactsBroadcastsTemplatesWebhooksAPI keys, suppressions, metrics
Deliverability
Deliverability
Authentication
Every message is DKIM-signed with your domain key. The return-path is [email protected], so SPF aligns with your From domain, which is what DMARC requires.
Bounces
A hard bounce (5xx) is final: email.bounced fires and the address is suppressed. A soft failure (4xx or network error) emits email.delivery_delayed and retries at 1m, 5m, 15m, 1h, 2h, 4h, 8h then every 12h for up to 48 hours.
Complaints
Spam reports delivered by feedback loops (ARF) arrive at our inbound receiver and produce email.complained.
Reputation
The dashboard scores your team, each domain and each sending IP from 0 to 100. Keep bounce rate under 4% and complaint rate under 0.1%. Teams that exceed 10% bounces or 0.5% complaints over 100+ sends are paused automatically.