MailSlurp has powerful email reputation and authenticity checks that let you maintain sending deliverability and brand reputation.

Automated email‑auth regression checks

MailSlurp's domain‑scan engine performs recurring DNS and inbox tests so ops teams, QA engineers, and product managers can see deliverability risks in a single place.

Scheduled or on-demand domain sweeps (DNS level)

• Resolve and lint your DMARC, SPF, DKIM and BIMI records.
• Follow nested chains to detect hidden SPF hard‑fails.
• Verify DKIM selectors exist, keys are less than 512 bits old, and CNAME targets match.
• Flag policy drift—e.g., someone changed to .

Inbox ingest tests (message level)

Sends a probe email from your SMTP service to a temporary MailSlurp inbox.

• We parse the received headers (, , ) and compute spam‑scores via SpamAssassin.
• JSON results highlight mis‑alignment that only appears after delivery (e.g., a gateway re‑signing and breaking DKIM).

Both layers can be orchestrated via reputation scheduler inside the dashboard or programmatically using reputaiton endpoints.

Go further a with BIMI, ARC & TLS‑RPT now?

*Search volume for "BIMI logo not showing" has tripled in the last 12 months.

• Gmail and Yahoo now prioritise authenticated domains with BIMI and valid Brand Indicators.

MailSlurp checks:

• BIMI TXT syntax and SVG logo accessibility.
• ARC seal continuity when mail passes through forwarders.
• TLS‑RPT endpoints so you see encryption issues before ISPs do.