alesian.security
← Top 100 Domains

sentry.io

Number 84 of the Top 100 · Tranco rank 94

sentry.io is Sentry, a service apps use to report their errors. Many apps and websites send crash reports to it.

Can sentry.io be forged?

Can sentry.io be forged?

No. Receivers that check DMARC refuse mail that forges sentry.io or its subdomains.

The exact name
reject · subdomains reject · reports to Valimail
Names that copy
102 registered lookalikes can send mail. DMARC never sees them. See them →
Senders it names Google Workspace, Zendesk, SendGrid, +1
  • Google Workspace include:_spf.google.com· DKIM key found
  • Zendesk include:mail.zendesk.com· DKIM key found
  • SendGrid include:sendgrid.net
  • Marketo include:mktomail.com· DKIM key found
  • Google Workspace runs its mail hosts

These are the services the records name. A record can name a service no longer used, and a sender can sign without being named.

SPF-all · 5 of 10 lookups · 387 thousand addresses

Refuses others · 5 of 10 lookups · 0 of 2 void lookups · 386,625 IPv4 addresses · 6 IPv6 blocks · Includes of its senders

Every term and include
  • their record 98,304 1,536 /64s 1
  • their record 26,112 — 1
  • their record 241,152 — 2
  • their record 21,057 — 1
  • -all — — —
    • DKIM5 keys found
    • google._domainkey · rsa 2048· Google Workspace
    • k1._domainkey · rsa 1024
    • m1._domainkey · rsa 1024· Marketo
    • zendesk1._domainkey · rsa 2048· Zendesk
    • zendesk2._domainkey · rsa 2048· Zendesk

    We look under the selectors of the services the records name. A domain can have keys we do not find.

    Sending names 3 names, 3 at reject
    NamePolicySPF lookupsReports to
    de.sentry.ioreject0nowhere
    fleet.security.sentry.ioreject (inherited)0—
    s4s2.sentry.ioreject0nowhere
    ReportsValimail, and elsewhere on 2 names

    Aggregate reports (rua) go to mailto:dmarc_agg@vali.email. No failure reports are asked for.

    Transport MTA-STS none · TLS-RPT none · BIMI none

    MTA-STS asks senders to deliver to sentry.io over encrypted connections only. TLS-RPT asks for reports when they cannot. BIMI shows a logo beside mail that passes DMARC at quarantine or reject.

    Read on Oct 28, 2026. Check it again yourself →

    Watch your own domain's mail this way: Sender Security · the DMARC Report