The deepest deliverability stack
in the category.
We don't just send mail. We instrument every hop, every handoff, every header, so when something goes wrong you have the data to fix it.
Reputation, checked where it counts.
Connect Google Postmaster Tools and we pull your domain reputation, spam rate and authentication ratios straight from Gmail. Every IP and domain is checked against 15 DNSBLs on top of that.
- Gmail reputation and spam rate via Postmaster Tools
- 15+ DNSBL real-time monitoring
- Per-domain backoff when a receiver starts deferring
Aggregate reports, parsed and humanized.
ISPs send DMARC aggregate reports as compressed XML. We ingest, parse, and surface them, with source breakdown, alignment failures, and policy advice.
- Reporter-by-reporter pass/fail rates
- Source IP breakdown with reverse-DNS
- Suggested policy upgrades (none → quarantine → reject)
RFC 3463 + heuristic classification.
Hard bounces, soft bounces, and the grey zone in between. Every DSN is parsed against RFC 3464 and classified on its RFC 3463 enhanced status code, so a full mailbox and a dead address are not treated the same way.
- Per-recipient bounce history with full DSN
- Auto-suppression on hard bounces
- Per-ISP soft-bounce retry curves
Catch bad addresses before they bounce.
Validate addresses on the way in (syntax, domain, MX, and mailbox checks) so you protect your sender reputation instead of repairing it after the fact.
- Real-time validation on signup forms and via API
- Syntax, domain, and MX verification
- Mailbox checks to weed out dead and risky addresses
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