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Email infrastructure — DNS audit

Find out why your emails end up in spam

DKIM, DMARC, SPF and MX records — 4 checks at once. Try for free.

Advanced settings (DKIM selector)

If your mail server uses a non-standard DKIM selector (e.g. "mail3"), enter it here. You can find it in your DNS settings under a TXT record like <code>NAME._domainkey.your-domain</code>. Pinsero will try it first.

No signup. Results in seconds.

How does it work?

1
Enter URL
Paste your website address — we analyze publicly available content, no login required.
2
AI analyzes
Pinsero scans your website content, context and contextual signals in real time.
3
You get a report
See specific results and prioritized recommendations in 30-60 seconds.

What does the Mail DNS audit check?

A complete check of 4 DNS records that decide whether your emails land in the inbox or spam.

  • MX records + priority
    Who receives mail for your domain, in what order. Backup mail servers, anti-spam routing.
  • SPF — sender authorization
    Who is allowed to send email from your domain. Detects too-many-lookups, wrong ~all/-all, syntax errors.
  • DKIM — digital signature
    Checks DKIM selectors (default, google, etc.) + key strength. Without DKIM, Gmail/Outlook often reject mail.
  • DMARC — anti-spoofing policy
    What providers should do with suspicious mail. p=none/quarantine/reject + percentage + reporting addresses.
  • Specific fix recommendations
    For each finding you see the exact DNS record to add — copy-paste solutions, no hand-waving.
  • Plain-English explanations
    Every DNS term has a clear explanation — no need to dig around Stack Overflow.

Who is the Mail DNS audit for?

For anyone who runs email from their own domain — from small e-shops to enterprise.

  • Webmasters
    Check before launching marketing campaigns
  • IT managers
    Audit of company email infrastructure
  • Marketing managers
    Deliverability — why mailing campaigns fail
  • E-commerce teams
    Trustworthiness of transactional emails (orders, password reset)
  • IT consultants
    Audit of client email systems

How much does the Mail DNS audit cost?

3 credits = 9 Kč
per scan
  • ✓ No registration 3× free per day (teaser)
  • ✓ 20 credits bonus after registration
Buy credits → Try for free

Try it free on pinsero.ai

Click and see the audit of our own mail infrastructure.

FAQ about the Mail DNS audit

Why do my emails land in spam?
Most common reasons: missing SPF, wrong DKIM selector, or no DMARC. The Mail audit shows exactly which record is missing and how to fix it.
What are SPF, DKIM and DMARC?
SPF says "who is allowed to send from my domain", DKIM digitally signs every email, DMARC tells providers "what to do with non-matching mail". Without all three, modern email providers (Gmail, Outlook) will not deliver.
Does it work for Gmail / Microsoft 365 too?
Yes. Pinsero checks DNS records, so it works for any mail provider — Google Workspace, Microsoft 365, Mailgun, Sendgrid, your own mail server.
What if I do not run my own mail server?
Even if you use Google Workspace or Microsoft 365, you have to manage DNS records yourself (at your DNS provider). The audit helps verify they are set correctly.
How often should I run the DNS audit?
Recommended: quarterly + before every major campaign. DNS changes sometimes happen unexpectedly (provider update, migration, etc.).
Which blacklists do you check?

In Mail DNS audit we check 30 most important blacklists (DNSBL/DBL) grouped into 3 tiers by trust level. If your domain or mail server appears on any of them, you get a direct delisting link.

Tier 1 — top trust (used by Gmail, Outlook)

Spamhaus ZENzen.spamhaus.orgIPdelist →
SpamCopbl.spamcop.netIPdelist →
SORBS Spamspam.dnsbl.sorbs.netIPdelist →
Barracuda BRBLb.barracudacentral.orgIPdelist →
UCEPROTECT L1dnsbl-1.uceprotect.netIPdelist →
PSBLpsbl.surriel.comIPdelist →
Mailspikebl.mailspike.netIPdelist →
Spamhaus DBLdbl.spamhaus.orgDomaindelist →
SURBL Multimulti.surbl.orgDomaindelist →

Tier 2 — useful

UCEPROTECT L2dnsbl-2.uceprotect.netIPdelist →
UCEPROTECT L3dnsbl-3.uceprotect.netIPdelist →
Manitu NiX Spamix.dnsbl.manitu.netIPdelist →
BLOCKLIST.DEbl.blocklist.deIPdelist →
S5H Combinedall.s5h.netIPdelist →
Truncate (GBUdb)truncate.gbudb.netIPdelist →
WPBLdb.wpbl.infoIPdelist →
SpamRats SPAMspam.spamrats.comIPdelist →
SpamRats DYNAdyna.spamrats.comIPdelist →
CBL (AbuseAt)cbl.abuseat.orgIPdelist →
URIBL (SEM)uribl.spameatingmonkey.netDomaindelist →
Fresh (SEM)fresh.spameatingmonkey.netDomaindelist →

Tier 3 — contextual

Hostkarmahostkarma.junkemailfilter.comIPdelist →
DroneBLdnsbl.dronebl.orgIPdelist →
Suomispambl.suomispam.netIPdelist →
Backscatterbackscatter.spameatingmonkey.netIPdelist →
Spam Eating Monkeybl.spameatingmonkey.netIPdelist →
Abuse.ch Dronesdrone.abuse.chIPdelist →
CASA CDLcdl.anti-spam.org.cnIPdelist →
Korea Serviceskorea.services.netIPdelist →
Nordspam DBLdbl.nordspam.comDomaindelist →

Related Pinsero tools

If you deal with email, try these follow-up audits too.

Pinsero Guard →
Website security audit — SSL, security headers, mixed content. Domain trustworthiness = better email deliverability.
Pinsero Health →
Complete website audit. A slow website with SEO errors = mailing campaigns convert worse.
Pinsero Monitor →
Uptime monitoring. Track the availability of the website your email campaign points to.

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