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auth0.comemail setup

Public DNS report for auth0.com, read on September 27, 2026: authentication, the email tools its records reveal, the sender rules it meets, and what would raise its score. Every line is a public record.

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The Email StackPublic DNS Report
Report
TES-20260927-EB180C
Read
27 Sept 2026, 12:53 UTC
Source
Index snapshot
Domain

auth0.com

The three core checks pass. What is missing is the transport and trust layer around them.

4 of 8 checks pass · 6 tools visible in DNS · nothing urgent

C 67/100 Grade C
SPFValid, hard fail20/20
DKIM4 keys found15/15
DMARCPartial (p=quarantine)22/30
MX2 hosts10/10
MTA-STSNot published0/10
TLS-RPTNot published0/5
BIMINot published0/5
DNSSECNot signed0/5

1 · Authentication and transport

SPF

PassValid, hard fail

Anything not on the list is rejected. The strongest setting.

v=spf1 include:spf.mandrillapp.com include:amazonses.com include:_spf.intacct.com include:mktomail.com ip4:74.125.0.0/16 ip4:209.85.128.0/17 ip6:2001:4860:4864::/56 ip6:2404:6800:4864::/56 ip6:2607:f8b0:4864::/56 ip6:2800:3f0:4864::/56 ip6:2a00:1450:4864::/56 ip6:2c0f:fb50:4864::/56 exists:%{i}._spf.mta.salesforce.com ip4:205.220.176.21 ip4:205.220.164.21 ip4:168.245.48.84 ip4:168.245.73.252 ip4:50.31.57.204 ip4:198.21.5.209 ip4:167.89.21.169 ip4:167.89.14.31 ip4:167.89.126.180 ip4:167.89.110.192 ip4:208.185.229.0/24 ip4:208.185.235.0/24 ip4:148.59.108.0/23 ip4:148.59.106.0/23 ip4:159.183.193.109 ip4:159.183.213.105 ip4:159.183.213.107 ip4:159.183.214.96 ip4:159.183.213.204 ip4:159.183.200.101 ip4:149.72.233.170 ip4:149.72.90.103 ip4:192.254.124.136 ip4:198.37.159.181 ip4:167.89.51.134 ip4:192.174.90.242 ip4:159.183.191.229 -all

DKIM

Pass4 keys found

Selectors google, s1, s2, mandrill publish a public key. 2 of them point at a vendor by CNAME.

google._domainkey, s1._domainkey, s2._domainkey, mandrill._domainkey

DMARC

PassPartial (p=quarantine)

Failing mail goes to spam. One step from full enforcement.

v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@okta.com; sp=quarantine; fo=1;

MX

Pass2 hosts

More than one receiving server, so a single outage does not bounce mail.

10 mxa-00553301.gslb.pphosted.com
20 mxb-00553301.gslb.pphosted.com

MTA-STS

ReviewNot published

Sending servers cannot tell that this domain requires TLS, so inbound mail can be downgraded to plain text by anyone on the path.

TLS-RPT

OptionalNot published

Nobody is told when TLS to this domain fails. Cheap to add once MTA-STS is in place.

BIMI

OptionalNot published

DMARC is enforced, so this domain qualifies. Yahoo and Fastmail show the logo from the record alone; Gmail and Apple Mail also need a paid VMC or CMC certificate.

DNSSEC

OptionalNot signed

Optional. Signing the zone protects every record in this report from tampering.

2 · Tools visible in DNS

LayerToolEvidence
MailboxGoogle WorkspaceDKIM google._domainkey
GatewayProofpointMX mxa-00553301.gslb.pphosted.com
MarketingMailchimpDKIM mandrill._domainkey
MarketingMarketoSPF include:mktomail.com
TransactionalAmazon SESSPF include:amazonses.com
TransactionalSendGridDKIM s1._domainkey → s1.domainkey.u2172013.wl014.sendgrid.net

Only tools that leave a DNS trace appear. A shared DKIM selector is attributed only when its CNAME target names the vendor.

3 · Sender requirements (Google, Yahoo, Microsoft)

RequirementApplies toStatusNote
Authenticate with SPF or DKIMGoogleYahooMicrosoftVerifiedAt least one method is in place.
Bulk senders: both SPF and DKIMGoogleYahooVerifiedBoth are present.
Publish a DMARC record (p=none is enough)GoogleYahooMicrosoftVerifiedPolicy is p=quarantine.
From: domain aligns with SPF or DKIMGoogleYahooMicrosoftNot checkable hereNeeds a real message. The Send-a-Test report will check this.
Valid forward and reverse DNS for sending IPsGoogleYahooNot checkable hereDepends on the sending server, not the domain.
Encrypt in transit (TLS)GoogleYahooNot checkable hereOutbound TLS depends on your sending tool; MTA-STS would cover inbound.
One-click unsubscribe (RFC 8058) for marketing mailGoogleYahooNot checkable hereA message header, not a DNS record. Microsoft recommends it rather than requiring it.
Spam complaint rate under 0.1% (0.3% is the hard limit)GoogleYahooNot checkable hereRead it in Google Postmaster Tools and Yahoo Sender Hub. Google’s target is 0.1%; 0.3% is where enforcement starts.

4 · What to fix, in order

  1. P2

    Finish DMARC at p=reject

    Quarantine still delivers spoofed mail, just into spam.

    Publish at_dmarc.auth0.com
    v=DMARC1; p=reject; rua=mailto:dmarc@auth0.com; fo=1
  2. P3

    Publish MTA-STS (record and policy file)

    Tells sending servers to require TLS to your MX hosts, which prevents downgrade attacks. The TXT record alone does nothing: the policy file must be served over HTTPS at mta-sts.auth0.com. Start in testing mode, watch TLS-RPT, then switch to enforce.

    Publish at_mta-sts.auth0.com and https://mta-sts.auth0.com/.well-known/mta-sts.txt
    TXT  v=STSv1; id=2026100401

mta-sts.txt:
version: STSv1
mode: testing
mx: mxa-00553301.gslb.pphosted.com
mx: mxb-00553301.gslb.pphosted.com
max_age: 86400
  3. P3

    Publish TLS-RPT

    You get a report when TLS delivery to your domain fails; this is what notices a downgrade that MTA-STS is meant to prevent. The address must exist.

    Publish at_smtp._tls.auth0.com
    v=TLSRPTv1; rua=mailto:tls-rpt@auth0.com
  4. P3

    Add a BIMI logo record (optional)

    DMARC already qualifies. The logo must be SVG Tiny PS, square, served over HTTPS. Yahoo and Fastmail show it from the record alone; Gmail and Apple Mail also need a paid VMC or CMC certificate, and a VMC needs a registered trademark. Skip this unless the certificate is worth it to you.

    Publish atdefault._bimi.auth0.com
    v=BIMI1; l=https://auth0.com/.well-known/bimi.svg;
  5. P3

    Sign the zone with DNSSEC

    Protects every record in this report from being swapped in transit. Two steps: enable signing at your DNS host (one switch at Cloudflare and most others), then add the DS record it gives you at your registrar.

    Publish atauth0.com

Appendix · Raw DNS answers

NameTypeAnswer
auth0.comMX10 mxa-00553301.gslb.pphosted.com
20 mxb-00553301.gslb.pphosted.com
auth0.comA172.64.150.238
104.18.37.18
auth0.comTXTv=spf1 include:spf.mandrillapp.com include:amazonses.com include:_spf.intacct.com include:mktomail.com ip4:74.125.0.0/16 ip4:209.85.128.0/17 ip6:2001:4860:4864::/56 ip6:2404:6800:4864::/56 ip6:2607:f8b0:4864::/56 ip6:2800:3f0:4864::/56 ip6:2a00:1450:4864::/56 ip6:2c0f:fb50:4864::/56 exists:%{i}._spf.mta.salesforce.com ip4:205.220.176.21 ip4:205.220.164.21 ip4:168.245.48.84 ip4:168.245.73.252 ip4:50.31.57.204 ip4:198.21.5.209 ip4:167.89.21.169 ip4:167.89.14.31 ip4:167.89.126.180 ip4:167.89.110.192 ip4:208.185.229.0/24 ip4:208.185.235.0/24 ip4:148.59.108.0/23 ip4:148.59.106.0/23 ip4:159.183.193.109 ip4:159.183.213.105 ip4:159.183.213.107 ip4:159.183.214.96 ip4:159.183.213.204 ip4:159.183.200.101 ip4:149.72.233.170 ip4:149.72.90.103 ip4:192.254.124.136 ip4:198.37.159.181 ip4:167.89.51.134 ip4:192.174.90.242 ip4:159.183.191.229 -all
(+ 25 other TXT records: site-verification tokens and the like, omitted)
_dmarc.auth0.comTXTv=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@okta.com; sp=quarantine; fo=1;
<selector>._domainkey.auth0.comTXTgoogle → key published
s1 → CNAME s1.domainkey.u2172013.wl014.sendgrid.net
s2 → CNAME s2.domainkey.u2172013.wl014.sendgrid.net
mandrill → key published
_mta-sts.auth0.comTXTno record
_smtp._tls.auth0.comTXTno record
default._bimi.auth0.comTXTno record

How to verify this yourself. Every line above comes from public DNS. Run dig TXT _dmarc.auth0.com or dig MX auth0.com and compare. Method: theemailstack.com/methodology.

Scores weigh SPF 20, DKIM 15, DMARC 30, MX 10, MTA-STS 10, TLS-RPT 5, BIMI 5, DNSSEC 5. Message-level requirements (alignment, unsubscribe headers, complaint rate) are not checkable from DNS and are marked as such, never guessed.

Scan to re-run livetheemailstack.com/report/auth0.com

About this report

The Email Stack reads public DNS for well-known domains and publishes the result as a report, the same one anyone can generate for any domain at /report. It is a point-in-time read: records change, and a domain that scores C today may score differently next month. The "Re-run live" button reads DNS again in your browser.

Scores weigh SPF 20, DKIM 15, DMARC 30, MX 10, MTA-STS 10, TLS-RPT 5, BIMI 5 and DNSSEC 5. Tools are named only when a DNS record names the vendor; a shared DKIM selector counts only when its CNAME target does. Message-level requirements such as alignment and one-click unsubscribe cannot be read from DNS and are marked as such, never guessed. Method: how we detect tools.

Own this domain and see something wrong? DNS is the source; fix the record and the next read will show it. Questions to hello@theemailstack.com.