Free Domain Security Scanner & Email Health Scorecard
One scan, six security factors, one score. This scanner weighs MX redundancy, SPF health, DMARC enforcement strength, DKIM presence, BIMI branding and MTA-STS TLS enforcement into a single 0–10 posture score with prioritized remediation notes for every gap found.
Enterprise Domain Security & Configuration Scanner
Evaluate your domain against enterprise sending security standards: MX redundancy, SPF flattening, DMARC enforcement, DKIM key strength, BIMI visual logos, and MTA-STS TLS encryption.
Tool Overview: What It Does & Core Purpose
The **AutoSMTP Domain Scanner** delivers an objective, empirical security health score ranging from 0.0 to 10.0 for any outbound email domain. Moving beyond simple binary pass/fail checks, the scanner tests six fundamental architectural layers: mail routing redundancy, SPF mechanism efficiency, DMARC policy rigor, cryptographic DKIM signing, BIMI brand verification, and Mail Transfer Agent Strict Transport Security (MTA-STS). It outputs an ordered remediation roadmap so systems architects can systematically eliminate vulnerabilities that degrade deliverability.Key Advantages & Architectural Benefits
Advantage
**Holistic 6-Pillar Analysis:** Evaluates routing, authentication, key exchange, encryption, and visual branding in one interface.
Advantage
**Impact-Weighted Scoring:** Allocates score weight based on actual receiving ISP filtering severity (e.g., DMARC carries more weight than BIMI).
Advantage
**Clear Remediation Guidance:** Explains exactly what configuration change is required to elevate a sub-optimal score to enterprise tier.
Advantage
**Zero Infrastructure Overhead:** Queries public authoritative nameservers with zero software installation or DNS alteration required.
Email Marketing & Cold Outreach Integration
How This Tool Accelerates Email Campaigns & Deliverability
Domain reputation is fragile. A single configuration oversight—such as an SPF PermError or missing DMARC policy—can cause cold outreach campaigns to be flagged across Gmail and Outlook spam filters. AutoSMTP automates dedicated server clusters that ship with a pre-tuned 10.0 security rating, ensuring mail sent through your custom domain lands squarely in the primary inbox.Frequently Asked Questions (FAQs)
What constitutes a 10.0 Security Score? ▾
A perfect 10.0 requires redundant MX records, valid SPF within the 10-lookup threshold, strict DMARC (`p=reject`), verified 2048-bit DKIM, published BIMI with an accessible SVG logo, and active MTA-STS in `mode: enforce`.
Why is my domain penalized if it has only one MX record? ▾
A single MX record creates a critical single point of failure. If that mail host undergoes maintenance or experiences an outage, inbound emails, bounce notifications, and delivery status notifications (DSNs) cannot be received.
Does having an ‘ADEQUATE’ score prevent emails from reaching the inbox? ▾
An adequate score (6.5–8.4) may suffice for low-volume peer-to-peer correspondence, but high-volume cold outreach and transactional email sent at scale will face higher deferral rates and spam folder placement.
How often should an enterprise domain scan be conducted? ▾
Engineering teams should run domain scans weekly or whenever DNS records, ESP providers, or marketing automation platforms are modified.
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 6-factor scoring (weights shown per result)
- Prioritized audit items with impact ratings
- BIMI and MTA-STS coverage beyond basics
- Remediation-first output.
Frequently asked questions
What lowers my score the most?
Missing DMARC (critical), SPF PermError from lookup overruns, and single-MX setups. The scanner lists each finding by impact.
How is this different from the DNS Validator?
The validator grades the four core DNS pillars; the scanner adds BIMI, MTA-STS, MX redundancy weighting and a consolidated posture score.