--- title: "Email Deliverability Checker Tool Online: SPF, DKIM, DMARC - Web Aloha" description: "Free email deliverability checker. Verify MX, SPF, DKIM, and DMARC records for any domain. Identify email authentication issues that cause spam filtering and improve inbox delivery." canonical_url: "https://webaloha.co/tools/email-deliverability-checker/" markdown_url: "https://webaloha.co/tools/email-deliverability-checker.md" date_modified: "2026-07-12T00:00:00.000Z" --- # Email Deliverability Checker Last updated: Jul 12, 2026 Check your domain's email authentication, MX records, SPF, DKIM, and DMARC, in one scan. Find why your emails land in spam and get specific fixes. ## How the Email Deliverability Checker Works This tool queries your domain's DNS records to audit email authentication: 1. **MX records**, verifies your domain has mail exchange records pointing to email servers. Also detects your email provider (Google Workspace, Microsoft 365, Zoho, etc.). 2. **SPF validation**, checks for an SPF TXT record, validates the syntax, detects dangerous mechanisms like +all, and counts DNS lookups (10-lookup limit). 3. **DKIM detection**, scans 17 common DKIM selectors (google, default, selector1, brevo, mandrill, etc.) to verify DKIM signing is configured. 4. **DMARC analysis**, checks for a DMARC record, evaluates the policy (none/quarantine/reject), verifies report addresses (rua/ruf), and flags percentage restrictions. ## Why Email Authentication Matters Email authentication is no longer optional, it's required by major inbox providers: - **Google and Yahoo requirements (2024)**, bulk senders must have SPF, DKIM, and DMARC configured or face delivery failures. Even small senders see improved delivery with proper authentication. - **Spoofing and phishing protection**, without SPF, DKIM, and DMARC, anyone can forge emails that appear to come from your domain. Phishing attacks using your domain damage brand reputation and customer trust. - **Inbox placement vs spam folder**, properly authenticated emails are significantly more likely to reach the inbox. Missing authentication is one of the top reasons legitimate emails get filtered to spam. - **Domain reputation**, email providers track domain reputation over time. Consistent authentication builds a positive sending reputation that improves deliverability for all your emails. - **Business email reliability**, when clients, customers, or leads don't receive your emails, you lose revenue. Proper authentication ensures your transactional emails, newsletters, and business communications arrive reliably. After checking email authentication, verify your domain's DNS setup with our [DNS Lookup](https://webaloha.co/tools/dns-lookup/) tool and check your SSL certificate with the [SSL Certificate Checker](https://webaloha.co/tools/ssl-certificate-checker/). Also run a [security headers check](https://webaloha.co/tools/security-headers-checker/) to ensure your web server is hardened alongside your email setup. For full domain intelligence, the [WHOIS Lookup](https://webaloha.co/tools/whois-domain-lookup/) shows domain registration, registrar, and expiry details. ## How to Fix Email Authentication Issues Common fixes for email deliverability problems: - **Missing SPF**, add a TXT record to your DNS with `v=spf1 include:_spf.google.com ~all` (replace with your provider's include). Use ~all (soft fail) or -all (hard fail). - **Missing DKIM**, enable DKIM signing in your email provider's settings. Google Workspace, Microsoft 365, and most providers offer one-click DKIM setup that adds the DNS record automatically. - **Missing DMARC**, add a TXT record at `_dmarc.yourdomain.com` with `v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com`. Start with p=none to monitor, then upgrade to p=quarantine or p=reject. - **SPF +all**, change +all to ~all or -all immediately. +all means anyone can send as your domain, defeating the purpose of SPF entirely. - **Multiple SPF records**, merge into a single record. Having more than one SPF record causes authentication failures per RFC 7208. - **DMARC p=none**, after monitoring reports for 2-4 weeks, upgrade to p=quarantine (spam folder) and eventually p=reject (block). p=none provides no protection, it only monitors. For help setting up email authentication and improving deliverability, explore our [SEO services](https://webaloha.co/seo-services/) which include technical site audits covering email DNS configuration. Next steps ## Email Deliverability Checker related tools and articles Continue with the closest follow-up checks and guides based on this tool's topic, crawl intent, and optimization workflow. 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It uses Google DNS-over-HTTPS to query MX records, domain TXT records for SPF, \_dmarc TXT records, and 17 common DKIM selector names. The report shows pass, warning, or fail details, visible record values, detected MX provider when recognized, and suggested configuration actions. How is the email authentication score calculated? Each displayed pass contributes 10 points, each warning 4, and each failure 0, divided by 10 times the number of displayed checks. A recognized email-provider row can add another passing check, so compare the individual SPF, DKIM, DMARC, and MX findings rather than relying on the score alone. Why is SPF marked warning or failure? The tool fails missing or multiple SPF records. It warns when the single record contains +all, ?all, or more than ten counted DNS-lookup mechanisms. Review every legitimate sending service before editing SPF, merge senders into one record, and validate the final lookup count with a dedicated SPF parser. How should I interpret the DMARC warning? The implementation warns when policy is p=none, no aggregate-report address is found, or pct is below 100. Begin with monitored reporting, verify SPF or DKIM alignment for every sender, then move toward quarantine or reject in stages. Publishing enforcement without inventory can reject legitimate mail. Why does the tool say no DKIM record when DKIM is configured? DKIM records live under provider-defined selector names. The checker tries 17 common selectors but cannot discover every custom or rotating selector. A warning means none of those names returned a key, not that DKIM is definitely absent. Check a recent message or the provider setup page for the active selector. Does a high score prove that mail will reach the inbox? No. The scan covers public DNS authentication signals only. It does not send a message or measure SPF and DKIM alignment, sender reputation, IP reputation, blocklists, content, complaint rate, engagement, reverse DNS, TLS, unsubscribe behavior, or recipient-specific filtering. Why can a temporary DNS failure look like a missing record? The DNS helper returns an empty answer when its Google DNS-over-HTTPS request fails. A transient network or resolver problem can therefore resemble a missing MX, SPF, DMARC, or DKIM record. Confirm unexpected failures with your authoritative DNS provider and retry before changing configuration. What data is sent when I run the email check? The entered value is sent to the Web Aloha API, which extracts the domain and queries public DNS through Google. If you enter a full email address, that full address is included in the request URL, so enter only the domain when you do not want to transmit the local part. The endpoint contains no application-storage step for the input or report. Free 48-Hour Website Audit Not sure what to fix first on your own website? We'll review it and tell you, in plain English. Free & non-obligatory. [Get My Free Audit 💪](https://webaloha.co/free-website-audit/) ## Need Help with Email Deliverability? We configure SPF, DKIM, DMARC, and DNS for reliable email delivery, as part of our technical SEO audits. [See Maintenance Plans 🤙](https://webaloha.co/website-maintenance-services/)