A cold-email campaign can have perfect copy, a clean contact list, and still land in spam — because the sending domain's SPF, DKIM, or DMARC records aren't configured correctly. This is a DNS-level problem, not a copywriting one, and it's invisible until reply rates quietly drop.
What the three checks actually verify
SPF confirms which mail servers are allowed to send as your domain. DKIM verifies the message wasn't altered in transit, using a signature checked against a key published in your DNS. DMARC tells receiving servers what to do when SPF or DKIM fails — reject, quarantine, or allow through. Get any one of the three wrong, and inbox providers have a legitimate reason to distrust the domain.
Why this needs to sit inside the workflow, not next to it
It's easy to run a one-off checker before a campaign, get a clean result, and then forget to re-check after you swap your sending domain three months later. GrapMe's deliverability check is a live DNS lookup surfaced with a score the moment a mailbox or domain is connected — the same place SMTP setup already happens — so it isn't a step you have to remember separately.
What the score changes before you hit send
Launching a campaign yourself doesn't mean flying blind — you see the sending domain's current authentication score right there before you send. A weak score is a reason to pause and fix DNS records first, rather than finding out three weeks into a campaign that reply rates are near zero for reasons that had nothing to do with the message.
Beyond the initial check
The same suppression and bounce-classification logic that protects domain reputation during a send (hard/soft bounce handling, auto-suppression) works alongside the authentication score — the two together are what "deliverability-safe sending" means in practice, not just a good SPF record on day one.
Get in touch if you want to see what your current sending domains score before your next campaign goes out.