Omnisend will verify your domain on a single passing record, but Gmail and Yahoo won't — so half-authenticated Omnisend mail still misses the inbox until all three records are in place.
Omnisend generates your SPF, DKIM and DMARC records per-domain inside the app rather than publishing fixed values, and it verifies a domain if at least one of the three is valid — but “at least one” isn't enough for Gmail and Yahoo, so add all three and set DMARC to p=none with relaxed SPF/DKIM alignment, as Omnisend recommends. The DKIM host follows the standard <selector>._domainkey form. Source: support.omnisend.com · verified 2026-07-15
p=none and a rua address, watch reports for a week, confirm this sender shows 100% pass.No. Adding SPF includes and DKIM records only adds authentication — it never blocks existing mail. The only risky step is tightening your DMARC policy, and that comes later, after reports confirm everything passes.
Send yourself a test email and inspect the headers for spf=pass, dkim=pass and dmarc=pass — or just watch your DMARCKeeper dashboard: the sender's pass rate should hit 100% within a day or two.
Yes. SPF and DKIM authenticate mail; DMARC is what tells receivers to BLOCK mail that fails, and it's the piece Gmail, Yahoo and Outlook now check for explicitly.