Almost every deliverability disaster starts with a DNS record that is missing, malformed, or was correct until someone edited the zone. You find out from your open rates, weeks later.
Sellvance now checks your sending domains against live DNS and reports each record individually: SPF, DKIM, DMARC, and MX, each pass or fail, with the value it found next to the value it expected.
Checks run automatically on a schedule and can be re-run on demand after you change something, so you get a confirmation rather than a hope. A domain with a failing record is flagged before you attach a campaign to it.