Free Email Deliverability Test: Six-Factor Infrastructure & Sender Score Audit
Run the full-stack audit receivers run on you. One scan checks SPF (with lookup limits), DKIM, DMARC enforcement, MX redundancy, BIMI and MTA-STS, and returns a weighted sender score with the exact remediation order that moves it fastest. Every factor links to a dedicated deep-checker and generator pair.
Tool Overview: What It Does & Core Purpose
Email deliverability is an interconnected ecosystem of technical standards, server infrastructure, cryptographic keys, and algorithmic reputation. Auditing only one factor (such as SPF alone) creates a false sense of security while hidden bottlenecks—such as missing reverse DNS, blacklisted IP ranges, or shared pool throttling—quietly divert your campaigns to the spam folder.
Our Free Email Deliverability Test evaluates your sending ecosystem across 10 foundational pillars: SPF records, 2048-bit DKIM signatures, DMARC policy enforcement, Forward-Confirmed Reverse DNS (FCrDNS), TLS 1.3 encryption, DNSBL blacklist reputation, bounce handling, feedback loop ingestion, domain maturity, and sending infrastructure architecture. It generates an authoritative 0–100 Deliverability Score and an itemized remediation roadmap.
Key Advantages & Architectural Benefits
Comprehensive Six-Factor Assessment
Audits the entire email sending pipeline in a single unified test, from root DNS records to physical MTA architecture.
Authoritative 0-100 Sender Score
Instantly benchmarks your deliverability health against enterprise sending standards.
Detects Hidden Infrastructure Gaps
Pinpoints obscure technical failures like missing PTR records, lookup limit overflows, and shared IP noise.
Tailored to Your Daily Sending Volume
Adjusts recommendations and safe scale limits based on whether you send 500 emails or 500,000 emails per day.
Email Marketing & Cold Outreach Integration
How This Tool Accelerates Email Campaigns & Deliverability
High-volume email marketing platforms like MailWizz, KumoMTA, and PowerMTA are only as effective as the underlying delivery infrastructure. If your infrastructure scores poorly on this test, even the most personalized marketing emails will be throttled or discarded by recipient firewalls.
By conducting regular six-factor audits before and during major sales campaigns, you protect your company from sudden catastrophic drops in inbox placement, maintaining peak deliverability and maximizing revenue per email sent.
Frequently Asked Questions (FAQs)
What are the 10 pillars of enterprise email deliverability? ▾
The 10 pillars are: 1) SPF validation, 2) 2048-bit DKIM signing, 3) DMARC policy enforcement, 4) FCrDNS reverse PTR records, 5) TLS encryption, 6) DNSBL blacklist cleanliness, 7) Automated 550 bounce suppression, 8) Complaint Feedback Loop (FBL) ingestion, 9) Domain registration age maturity, and 10) Dedicated sovereign server infrastructure.
Why is shared IP sending dangerous for cold email? ▾
On shared platforms (like SendGrid, Mailchimp, or shared VPS providers), your emails share the exact same IP addresses with thousands of other users. If another user sends spam, the IP gets blacklisted, and your legitimate emails land in spam through no fault of your own.
How do I improve my Deliverability Score from Good to Excellent? ▾
Ensure you have a strict DMARC policy (p=quarantine or reject), upgrade DKIM keys to 2048-bit, maintain dedicated IPv4 addresses with matching PTR records, and enforce strict list hygiene to keep bounce rates under 1.0%.
How often should I run a deliverability audit? ▾
Run a comprehensive audit at least once per month, and immediately whenever you observe an unexplained drop in open rates, an increase in bounce notifications, or after making DNS changes.
How does AutoSMTP provide a perfect six-factor score? ▾
AutoSMTP provisions enterprise bare-metal PowerMTA and KumoMTA servers pre-configured with all 10 pillars: dedicated clean IPv4 blocks, automated FCrDNS, 2048-bit DKIM, automated DMARC, native bounce suppression, and algorithmic IP warming.
Free tools help you audit and optimize individual elements, but sustained enterprise email delivery requires dedicated bare-metal infrastructure. AutoSMTP replaces fragile shared relays with private bare-metal PowerMTA and KumoMTA clusters configured automatically in 15 minutes.
Turnkey Dedicated Bare-Metal Clusters
Provisions fully licensed PowerMTA/KumoMTA clusters on enterprise bare-metal with flat predictable pricing and zero third-party markups.
Automated Gas-Pedal IP Warming
Monitors Google Postmaster spam ratios (<0.10%) and real-time deferrals across clean IPv4 subnets to scale daily send limits safely.
Native FBL & Socket Interceptors
RFC 5321 in-band 550 bounce suppression + automated Yahoo/Outlook CFL ingest to protect sender score automatically.
Fully Managed DNS & Auth
Pre-configured rDNS/PTR, SPF, 2048-bit DKIM, strict DMARC, and BIMI integration synchronized across your domain portfolio.
Deploy Your Dedicated Email Infrastructure Today
Stop risking your sender reputation on shared pools. Get dedicated IPv4 subnets, custom reverse DNS, and automated deliverability engineering.
Key capabilities
- Weighted multi-factor sender score
- Each factor scored and explained
- Fix-first remediation order
- Deep links to per-record tools.
Frequently asked questions
What’s a good sender score?
8.5+/10 before scaling volume; every missing factor is quantified so you know what each fix buys.
How is this different from the single checkers?
It runs the composite engine — all factors, weighted, in one pass — and sequences your fixes.