10 Free Email and Domain Tools You Should Use Today

Free Tools That Save Hours of Manual Checking#

Diagnosing email deliverability and domain health used to mean logging into multiple services, running separate lookups, and piecing together results manually. That's a lot of friction when you just need to know if your domain is healthy before sending an important campaign.

Nova Uptime offers a set of free tools that handle all of this from one place. No account required for basic checks. Here's what each tool does and when you should use it.

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Email Authentication Tools#

These tools check whether your domain's email authentication records are properly configured.

1. Email Health Checker#

What it does: Runs a comprehensive check across all four pillars of email authentication — MX records, SPF, DKIM, and DMARC — plus blacklist scanning. Returns an overall score and grade.

When to use it: Before launching any email campaign, after making DNS changes, or as a regular monthly health check.

Try it: Email Health Checker

2. SPF Checker#

What it does: Validates your SPF record specifically. Checks for syntax errors, too many DNS lookups (the 10-lookup limit is a common pitfall), and whether your policy is strong enough.

When to use it: After adding a new email sending service, when troubleshooting specific SPF failures, or if your email health score shows SPF issues.

Try it: SPF Checker

3. DKIM Checker#

What it does: Scans your domain for DKIM records across common selectors. Verifies that your DKIM signing is properly configured and that public keys are published.

When to use it: After enabling DKIM through your email provider, or when investigating why DKIM alignment fails in DMARC reports.

Try it: DKIM Checker

4. DMARC Checker#

What it does: Validates your DMARC record, checks your policy strength, and verifies reporting configuration. Shows whether you're in monitoring mode or actively enforcing.

When to use it: When setting up DMARC for the first time, when upgrading from p=none to a stricter policy, or when debugging authentication alignment issues.

Try it: DMARC Checker

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Reputation and Risk Tools#

These tools evaluate your domain's reputation signals beyond authentication records.

5. Blacklist Checker#

What it does: Checks your domain and its associated mail server IP addresses against dozens of DNS blacklists. Shows which lists you appear on and provides context for delisting.

When to use it: Before any major email send, after receiving reports of delivery failures, or as part of regular domain hygiene.

Try it: Blacklist Checker

6. Inbox Risk Checker#

What it does: Evaluates all the signals that affect whether your emails reach inboxes — authentication, blacklists, domain reputation, and more. Provides an overall risk assessment for your sending domain.

When to use it: Before cold email campaigns. When evaluating a new sending domain. When you need a quick overall health verdict rather than digging into individual checks.

Try it: Inbox Risk Checker

7. Domain Age Checker#

What it does: Looks up your domain's registration date, age, registrar, and last update. Shows you how established your domain is in the eyes of email providers.

When to use it: When evaluating a new domain for email outreach, checking domains before purchasing them, or understanding why a young domain has deliverability issues.

Try it: Domain Age Checker

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Campaign and Monitoring Tools#

These tools help with planning campaigns and ongoing domain management.

8. Cold Email Campaign Simulator#

What it does: Takes a list of sending domains and analyzes each one for campaign readiness. Identifies which domains are healthy, which have issues, and ranks them by deliverability potential.

When to use it: Before launching cold outreach campaigns that use multiple sending domains. Helps you decide which domains to use and which to bench.

Try it: Cold Email Campaign Simulator

9. SSL Certificate Checker#

What it does: Checks your domain's SSL/TLS certificate validity, expiry date, issuer, and configuration. Shows days remaining before expiry.

When to use it: Regular monitoring to prevent expired certificate outages, after installing or renewing certificates, or when debugging HTTPS connection issues.

Try it: Sign up for free at Nova Uptime to monitor SSL certificates continuously.

10. Domain Expiry Checker#

What it does: Monitors your domain registration expiry date via WHOIS/RDAP. Alerts you before your domain expires so you never lose a domain due to missed renewal.

When to use it: For all business-critical domains. Domain expiry is one of the most preventable causes of complete email and website outages.

Try it: Sign up for free at Nova Uptime to track domain expiry alongside uptime.

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How These Tools Work Together#

Each tool serves a specific purpose, but the real power comes from using them together. Here's a practical workflow:

For a New Sending Domain#

1. Domain Age Checker — Verify the domain is old enough for outreach
2. Email Health Checker — Confirm SPF, DKIM, DMARC, and MX are configured
3. Blacklist Checker — Make sure the domain is clean
4. Inbox Risk Checker — Get the overall risk verdict

Before a Cold Email Campaign#

1. Campaign Simulator — Evaluate all your sending domains at once
2. Inbox Risk Checker — Double-check the domains you plan to use
3. Fix any issues identified, then re-check

Regular Maintenance (Monthly)#

1. Email Health Checker — Run on all your domains
2. Blacklist Checker — Catch any new listings early
3. SSL Certificate and Domain Expiry monitoring — Prevent infrastructure failures

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Free vs. Monitored#

All the tools listed above can be used for one-off checks without creating an account. For ongoing monitoring — automatic alerts when your email health degrades, SSL certificates approach expiry, or domains go down — Nova Uptime's free tier includes five monitored domains with WhatsApp alerts, email notifications, and a full dashboard.

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Related Reading#

• How to Check Inbox Risk Before Sending Cold Emails — Deep dive on inbox risk
• Complete Guide to Email Health Checker — Full email authentication walkthrough
• Why Domain Age Matters for Email Deliverability — Domain age impact on email
• Check Your Cold Email Deliverability Before Hitting Send — Pre-send campaign checklist
• SPF, DKIM, and DMARC: The Complete Guide — Master email authentication
• Email Blacklist Check & Removal Guide — Complete blacklist removal procedures