AITHER Original · 04 · Free, no sign-up
Is your cold email quietly going to spam?
A broken SPF record, a missing DMARC policy, or a blacklisted sending IP can silently tank your outreach — no error, no warning, just replies that never come. AITHER Guard checks all four in seconds and tells you exactly what's wrong, in plain English.
Real DNS, not a guess
We query your domain's actual public DNS records — the same data every mail server on earth already checks before deciding whether your email reaches an inbox.
Plain English, not jargon
Not "SPF PermError" — instead: what's wrong, why it matters, and the exact fix. Built for marketers running cold outreach, not network engineers.
The blind spot most tools skip
SPF and DMARC checkers are common. Real-time blacklist checks against active DNSBL zones — the thing that silently kills deliverability — are rarer and usually paywalled.
Free, no sign-up
Check any domain right now. No account, no email required, no credit card.