certifyos.com

Valid Email Server
Domain Lookup › certifyos.com
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
certifyos.com
Yes
✓ Yes
Google
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-05-20 21:10:56 UTC · ↺ Refresh

MX Hostnames

  • alt2.aspmx.l.google.com
  • aspmx.l.google.com
  • alt3.aspmx.l.google.com
  • alt1.aspmx.l.google.com
  • alt4.aspmx.l.google.com

MX Priorities

No priority data.

A / AAAA Records

  • 76.76.21.21

Mail Server IPs

No IPs resolved.

SOA Record

No SOA record found.

Nameservers (NS)

ns-1839.awsdns-37.co.uk
ns-229.awsdns-28.com
ns-540.awsdns-03.net
ns-1115.awsdns-11.org

SPF Record

✓ Soft Fail (~all)
v=spf1 include:40166028.spf01.hubspotemail.net include:_spf.google.com include:_spf.salesforce.com include:email.chargebee.com include:_spf.chargebee.com ~all
📊 DNS lookups: 5/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

~ Quarantine
v=DMARC1; p=quarantine; pct=50
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
⚠ Policy applies to 50% of failing messages only

DKIM Selectors

✓ 3 found
google._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: google

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

20 records
  • google-site-verification=gXM7b_Y0E7qJx6mvtCTh9BFYs6TuhpNrJecz8gXGgK8
  • MS=2C95DB8A94DDA0E31A270C9AF001989E498C535
  • cursor-domain-verification-q4ffx7=6qhvE9CatPnr2Y6WDatwhEa4o
  • anthropic-domain-verification-y9tdzg=lWr1B6BnpnEyj7bGxB4t1ZMLH
  • slack-domain-verification=0DmXbAO1Q9m18wB8QtRgSplOveUkwUQmV3sTX2JV
  • postman-domain-verification=1dd336e06f95914252964d67729bab70af17df451fe0329d40652ca4f5e7cd74816702a363e2d7d73692133d6beeea8688499eda55a588a104bd03d119ce9024
  • apple-domain-verification=C5ARCoxb7WrHOGhL
  • atlassian-sending-domain-verification=d8c60223-4fab-4aef-b071-34c0145e1f72
  • google-site-verification=AFi4l4IDNgcA2XmImxUVA59cyZ5v65u54opJ_peoc3s
  • google-site-verification=r1UJ4-srilOhLY4Gw6DqT2sokT6qUnFWIUwBba7rRsI
  • SPFv=spf1 include:40166028.spf01.hubspotemail.net include:_spf.google.com include:_spf.salesforce.com include:email.chargebee.com include:_spf.chargebee.com ~all
  • openai-domain-verification=dv-RdZwueiyuIUll1J1Q7UUkZ4z
  • google-site-verification=84f823e7-f20e-4aa3-aebb-93b6fd938e33
  • airtable-verification=83fc00f1a4027976ebcfe05fbbcedb0a
  • atlassian-domain-verification=Cx7/Nji0gldU3NnnQMUNawj62VnE9nMUcTy9kfVfgbDWqQITmiaMAhYQy8khRjm9
  • whimsical=081fb2387797ee140fc48f2b5977bedd7b018444
  • google-site-verification=XnjLyPnVmo4Uv0VXCZbJK5i-FuyNjwXUnK_JX4qm_xE
  • pardot1005922=bac531352b7f1b52af2dc9f2a3438217c0986ab4f7243619a2af08545cc698ca
  • google-site-verification=S_Ux3dbZ9eYHFfq-mjEk7ZMf4CgPg-LZyPUY78ZuSZs
  • google-site-verification=p762uv2CikTo_usgKhGoR5nYA5l6Q4mssCkEwApHIgI
Full email verification for certifyos.com

Run SMTP check, SPF/DKIM/DMARC and catch-all detection.

SPF / DKIM / DMARC Get 1,000 Free Credits