Test the authentication, blacklist, and content signals that decide whether your emails reach the inbox.
ESP dashboards show "delivered" even when emails land in spam or promotions. The only way to know whether your emails reach the primary inbox is to test the signals that mailbox providers actually score on: authentication (SPF, DKIM, DMARC), blacklist status, and content.
EmailQo publishes free tools for each of these checks so you can diagnose problems before you send a campaign. None of them require a signup.
Full domain deliverability score (out of 100) combining SPF, DKIM, DMARC, MX, and blacklist signals.
Paste your subject line and body; scans 150+ spam trigger words and tells you exactly what to change.
Validate your SPF DNS record. Catches syntax errors, DNS lookup limits, and common misconfigurations.
Verify your DKIM public key, version tag, and key type for any domain and selector.
Check your DMARC policy, reporting addresses, and alignment settings.
Authentication. SPF, DKIM, and DMARC are the three DNS records mailbox providers use to decide whether to trust your sending domain. Missing or misconfigured records are the single most common reason cold email lands in spam.
Content. Spam trigger words in the subject line and body, missing unsubscribe links, and poor text-to-image ratios all lower placement. The Spam Checker shows which phrases to swap out.
Reputation. Public blacklists (Spamhaus, SURBL, others) flag domains and IPs with a history of abuse. Being listed on even one can stop inbox placement cold at major providers.
One-off checks catch problems today. Ongoing monitoring catches problems before they show up as dropped reply rates. EmailQo runs these checks automatically before every campaign and includes warmup and reply classification on every plan.
Start a 7-day free trial at emailqo.com/signup, no credit card required.