All free, no signup

Email Deliverability Tools

Professional diagnostics to check, fix, and monitor every part of your email setup. Enter a domain, an IP, or paste headers, and get clear results in seconds.

Reputation and analysis
Flagship

Sender Reputation Checker

Get a free A to F Sender Reputation Score with a full authentication, blacklist, and infrastructure audit of any domain.

Check your domain

Blacklist Checker

Scan the most impactful DNS blacklists instantly for your domain or IP, and see exactly where you are listed.

Scan blacklists

Email Header Analyzer

Paste raw email headers to trace the delivery path, read authentication results, and spot delays or spoofing.

Analyze headers
Email authentication

SPF Record Checker

Validate your SPF syntax, count DNS lookups against the limit of 10, and parse every mechanism.

Check SPF

DKIM Record Checker

Confirm your DKIM key is published, well formed, and using a strong key length.

Check DKIM

DMARC Record Checker

Check your DMARC policy, alignment, percentage, and aggregate reporting setup.

Check DMARC
DNS and infrastructure

MX Lookup

Look up mail exchange records, priorities, and redundancy for any domain.

Look up MX

Reverse DNS Checker

Verify a sending IP has a valid, forward confirmed PTR record.

Check rDNS
Record generators

SPF Record Generator

Build a clean SPF record by selecting your sending sources and policy, with a live lookup count.

Generate SPF

DMARC Record Generator

Generate a valid DMARC record with the right policy, reporting, and alignment for a safe rollout.

Generate DMARC
Why these tools

Everything you need to reach the inbox

Email deliverability rests on a stack of technical signals: authentication, blacklist status, DNS, and infrastructure. Each tool here isolates one of those signals, explains what it found in plain language, and tells you exactly what to fix. Used together, they cover the full picture that mailbox providers like Google, Microsoft, and Yahoo evaluate before deciding where your mail lands.

  • Sender Reputation Score. A single A to F grade across authentication, blacklists, DNS, and infrastructure for any domain.
  • Authentication. Validate SPF, DKIM, and DMARC, the three records every modern sender needs in place.
  • Blacklist status. See whether your domain or sending IP appears on the major DNS blacklists.
  • DNS and infrastructure. Confirm MX records and reverse DNS so receiving servers trust your mail.

How to choose the right tool

Each tool isolates one signal, so pick by the symptom you are seeing. If mail is landing in spam with no obvious cause, start broad with the reputation checker. If a specific provider is rejecting you, check your blacklist status and reverse DNS. If a message looks spoofed or arrived oddly, paste its headers into the analyzer. And if you are setting a domain up from scratch, the SPF and DMARC generators build clean records before you ever publish.

The order to run them in

Work from the overall grade down to the individual records. Run the Sender Reputation Checker first for one A to F view across every signal. It tells you which category is dragging you down, then you open the matching tool to fix it: SPF, DKIM, or DMARC for authentication, the blacklist checker for listings, and the MX and reverse DNS tools for delivery basics. Re-run the reputation check at the end to confirm the grade moved.

What a healthy setup looks like

The same baseline turns up across every check. A healthy domain publishes exactly one valid SPF record that stays under the ten-lookup limit, signs with a 2048-bit DKIM key, and enforces a DMARC policy at quarantine or reject. Its sending IPs carry valid reverse DNS, its MX records resolve, and it stays off the major blacklists. Hit those and your mail clears the bar that Google, Microsoft, and Yahoo set for bulk senders.

No signup, no account, no limits on normal use. Start with the Sender Reputation Checker for a full overview, then drill into any record with the dedicated tools.

Frequently asked

Common questions

Are these email deliverability tools free?
Yes. Every tool here is completely free with no signup, no email required, and no limits on normal use. They read publicly available DNS and blacklist data, so you can check any domain or IP you manage as often as you need.
What is the best way to check email deliverability?
Start with the Sender Reputation Checker for a full A to F overview, then use the dedicated tools to fix whatever it flags: validate SPF, DKIM, and DMARC, confirm you are not blacklisted, and check your MX and reverse DNS. Re-run the reputation check to confirm the grade improved.
Do I need an account to use these tools?
No account is needed. Enter a domain, an IP address, or paste your email headers and you get instant results. We do not store the domains you check.
Which tool should I run first?
Run the Sender Reputation Checker first. It audits authentication, blacklists, DNS, and infrastructure in one pass and points you to the specific records that need attention, so you know which dedicated tool to open next.
How often should I check my email setup?
Check at least monthly if you send regularly, and immediately if you notice a drop in open rates, rising bounces, or delivery failures. High volume senders benefit from weekly checks to catch issues before they affect the inbox.
What are the Google and Yahoo sender requirements?
Since February 2024, Google and Yahoo require bulk senders, generally those sending more than 5,000 messages a day to their users, to authenticate with SPF, DKIM, and DMARC, keep spam complaints low, and offer one-click unsubscribe. Microsoft has since adopted similar expectations. For any sender the takeaway is the same: publish all three authentication records and keep complaints well under the thresholds. The Sender Reputation Checker and the SPF, DKIM, and DMARC tools here confirm you meet the bar.
What is a good email bounce and complaint rate?
Aim to keep your hard bounce rate under about 2 percent and your spam complaint rate under 0.1 percent, which is the threshold the major providers watch. Higher numbers signal poor list hygiene or unwanted mail and pull your reputation down quickly. Clean invalid addresses promptly, remove long-term non-openers, and send mainly to people who engage to stay comfortably inside those limits.
How do I improve my email deliverability?
Start with authentication: publish valid SPF, DKIM, and DMARC, since unauthenticated mail is now filtered or rejected outright. Then protect your reputation by keeping your list clean, sending to engaged recipients, and holding complaints and bounces low. If you are on a new domain or IP, warm it up gradually rather than sending at full volume on day one. Run the Sender Reputation Checker to see where you stand and what to fix first.
What is email warmup?
Email warmup is the process of gradually increasing how much you send from a new domain or IP while keeping engagement high, so mailbox providers build trust before you reach full volume. Sending a large burst from an unknown source looks like a spam outbreak and gets filtered, whereas a steady ramp that starts with your most engaged recipients builds a positive reputation. Most warmups run over a few weeks.