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Email Authentication Report for postmarkapp.com

A live look at how postmarkapp.com configures SPF, DKIM, DMARC, and transport security, with the grade explained.

A

postmarkapp.com

90 out of 100

Scanned: Jul 6, 2026, 1:17 PM

Why this score

The score starts at 100. Every issue below subtracts points based on how much it hurts your deliverability or lets someone spoof you.

Starting score
100
SPFEnds with ~all (softfail).
-5
DMARCSubdomains are unprotected (sp=none).
-5
Your score
90

  • SPF

    -5Pass
    • -5

      Ends with ~all (softfail).

      A softfail asks receivers to accept mail from unlisted senders but flag it, so spoofed messages can still reach the inbox.

      How to fix: Move to -all after confirming that all of your senders are included, so unauthorized mail is rejected.

    DNS lookups7 / 10
    v=spf1 a mx include:spf.mtasv.net include:_spf.google.com include:cmail1.com include:mail.zendesk.com include:helpscoutemail.com ~all
    allQualifier
    ~

  • DKIM

    Pass

    • DKIM is set up (3 valid selector(s) found).

      At least one valid signing key was found, so your outgoing mail can be signed and verified by receivers.

    selectors
    google, zendesk1, zendesk2
    keyType
    rsa
    keyBits
    2048

  • DMARC

    -5Warning

    • Policy is p=reject (strongest).

      Reject tells receivers to refuse any mail that fails authentication, the strongest protection against spoofing.

    • Aggregate reporting is enabled.

      A rua address is set, so you receive daily reports showing every source that sends as your domain.

    • -5

      Subdomains are unprotected (sp=none).

      Your main policy is enforced, but sp=none removes protection from every subdomain, so an attacker can still spoof addresses like news.postmarkapp.com.

      How to fix: Set sp=reject, or remove the sp tag so subdomains inherit your main policy.

    v=DMARC1; p=reject; pct=100; rua=mailto:re+j1puxgl6ln5@inbound.dmarcdigests.com; sp=none;
    policy
    reject
    subdomainPolicy
    none
    pct
    100
    rua
    mailto:re+j1puxgl6ln5@inbound.dmarcdigests.com
    adkim
    r
    aspf
    r
    Read the DMARC guide

  • MX

    Pass

    • MX is configured (5 mail server(s)).

      Your domain has MX records and every listed mail server resolves to an IP address, so it can receive mail.

    mxHosts
    aspmx.l.google.com (10), alt1.aspmx.l.google.com (20), alt2.aspmx.l.google.com (20), aspmx2.googlemail.com (30), aspmx3.googlemail.com (30)
    mxCount
    5

  • Blacklist

    Pass

    • Not on any checked blocklist.

      Your mail server IPs were not found on the public blocklists we checked. Reputation can change, so it is worth monitoring over time.

    ipsChecked
    142.250.147.27, 192.178.211.27, 192.178.158.26
    blocklists
    bl.spamcop.net, dnsbl.sorbs.net

Optional enhancements

Advanced, nice-to-have features. Setting these up (or not) does not change your grade.

  • DNSSEC

    Optional

    • DNSSEC is not enabled.

      DNSSEC is optional, but it protects against DNS spoofing by letting resolvers confirm your records are authentic. Most domains still do not use it.

      How to fix: If your DNS provider and registrar support it, enable DNSSEC to protect your domain from DNS tampering.

  • MTA-STS

    Optional

    • MTA-STS is not set up.

      MTA-STS is optional but recommended. It tells sending servers to require TLS when delivering mail to you, which blocks downgrade and man-in-the-middle attacks on your inbound mail.

      How to fix: Publish a _mta-sts TXT record and host a policy at https://mta-sts.<yourdomain>/.well-known/mta-sts.txt with mode enforce.

    Read the MTA-STS guide

  • TLS-RPT

    Optional

    • TLS reporting (TLS-RPT) is not set up.

      TLS-RPT is optional. It asks receivers to send you reports when TLS fails while delivering your mail, which is how you catch MTA-STS or certificate problems before they hurt delivery.

      How to fix: Publish a _smtp._tls TXT record with v=TLSRPTv1 and a rua address, for example rua=mailto:tlsrpt@yourdomain.

    Read the TLS-RPT guide

  • BIMI

    Optional

    • BIMI is not set up.

      BIMI is optional. It shows your logo next to your emails in supporting inboxes, but it needs an enforced DMARC policy and, for Gmail and Apple Mail, a Verified Mark Certificate (VMC).

      How to fix: With DMARC at quarantine or reject, publish a BIMI TXT record at default._bimi pointing to a square SVG logo, and add a VMC to display it in Gmail and Apple Mail.

    Read the BIMI guide

This report reviews the email authentication records published by postmarkapp.com. As a platform in the email and messaging space, its own configuration is a useful reference point for how sender authentication is meant to be done.

What this report checks

The grade above is derived directly from what postmarkapp.com publishes in DNS, so it reflects the domain exactly as a receiving mail server sees it. SPF lists the servers allowed to send on the domain's behalf. DKIM adds a cryptographic signature that proves a message was not altered in transit. DMARC ties the two together and tells receivers what to do when a message fails both checks. Transport records such as MTA-STS and TLS-RPT add a further layer by protecting the connection itself.

About this report

This report is generated from publicly available DNS records for postmarkapp.com and is provided for informational and educational purposes only. SPFWise is not affiliated with, endorsed by, or connected to the owner of postmarkapp.com. The records shown are the same ones any mail server can query, and the grade updates automatically as they change.

Want the same breakdown for your own domain? Run a free scan to get an identical grade along with the exact records to fix anything that is weak.

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Guides to fix common issues

Email Compliance: CAN-SPAM, GDPR and CASL Basics

A plain-English guide to the three laws that govern commercial email: CAN-SPAM in the US, GDPR in the EU, and CASL in Canada, covering consent, identification, unsubscribe, penalties, and how compliance overlaps with deliverability.

Dedicated vs Shared IP for Sending Email

A practical guide to choosing between a dedicated and a shared sending IP, weighing volume, reputation control, warmup burden, and cost, with a clear decision path.

Phishing vs Spoofing: What Is the Difference?

Spoofing is the technique of forging a sender identity; phishing is the fraud it enables. This guide explains the difference, how they overlap, and which defenses stop each.