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Email Deliverability Tools

Mail that bounces or lands in spam usually comes down to four DNS records, MX, SPF, DKIM and DMARC. These tools check each one, explain problems in plain words and write new records for you.

Email Deliverability Tools: all 8 tools

MAIL MX Record LookupSee which mail servers receive email for a domain, in priority order.
MAIL DMARC CheckerRead a domain’s DMARC policy and where its reports go.
MAIL Email Header AnalyzerPaste email headers to see the servers a message passed, delays and SPF/DKIM results.
MAIL Email Address CheckerCheck email addresses for typos, disposable domains and working mail servers.
MAIL SPF Record CheckerCheck an SPF record, expand its includes and count DNS lookups.
MAIL DKIM CheckerFind and check a domain’s DKIM keys, trying common selectors for you.
MAIL DMARC Record GeneratorCreate a DMARC record step by step, from monitoring to reject.
MAIL SPF Record GeneratorBuild a correct SPF record for your mail providers.

Check the four records

MX Record Lookup shows which servers receive mail for a domain, in priority order, and names the provider behind them. SPF Record Checker expands every include and counts DNS lookups against the limit of 10. DKIM Checker finds your signing keys, trying about 45 common selectors if you don't know yours, and DMARC Checker explains each tag of your policy and checks where reports go.

Write records that work

SPF Record Generator turns the services you tick, from Google Workspace to Tencent Exmail and SendGrid, into one record and counts its lookups. DMARC Record Generator writes the TXT record for the _dmarc host and explains how to move from none to quarantine to reject without blocking your own mail.

Look at one message or a whole list

Email Header Analyzer turns pasted headers into a hop-by-hop delivery path with delays, plus the SPF, DKIM and DMARC results the receiver recorded. Email Address Checker checks a list for typos, dead domains and disposable addresses, 20 at a time without an account, 50 with a free account and 500 as VIP.

How the checks run

Lookups run on our server when you click, through public DNS, and the results aren't stored. They don't use your daily tasks. An hourly allowance keeps them fair, and it's higher when you're signed in. The header analyzer and both generators run in your browser, so nothing you paste is uploaded.

FAQ

Email Deliverability Tools: questions and answers

Why do my emails go to spam?
Common causes are a missing SPF record or one over 10 lookups, no DKIM signature, no DMARC record, or a sending server that SPF doesn't list. Check each record here, then paste the headers of a message that landed in spam into the Email Header Analyzer to see which check failed.
What's the difference between SPF, DKIM and DMARC?
SPF lists the servers allowed to send for your domain. DKIM adds a signature that receivers verify with a public key in your DNS. DMARC tells receivers what to do with mail that passes neither in line with your From address, and where to send reports.
Are these email tools free?
Yes, with no sign-up. Lookups don't use your daily tasks but share an hourly allowance, higher for signed-in members and much higher for VIP. The header analyzer and the generators have no limit.
Do you keep the domains or addresses I check?
No. Lookups run the moment you click and the results aren't stored. The header analyzer and generators run in your browser, so headers never leave your device.
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