os.com

Valid Email Server
Domain Lookup › os.com

Domain Overview

DNS: ✓ 6h ago Checker: ✓ 6h ago
os.com
Yes
✓ Yes
Mailgun
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-05-20 16:46:27 UTC · ↺ Refresh

MX Hostnames

  • mxb.mailgun.org
  • mxa.mailgun.org

MX Priorities

  • mxb.mailgun.org: 10
  • mxa.mailgun.org: 10

A / AAAA Records

  • 34.149.91.73 ↩ 73.91.149.34.bc.googleusercontent.com

Mail Server IPs

  • 34.36.182.139 ↩ 139.182.36.34.bc.googleusercontent.com
  • 34.149.254.5 ↩ 5.254.149.34.bc.googleusercontent.com

SOA Record

Raw SOA ns-cloud-c1.googledomains.com cloud-dns-hostmaster.google.com 5 21600 3600 259200 300
Primary NS (mname)
ns-cloud-c1.googledomains.com
Admin Email (rname)
cloud-dns-hostmaster@google.com
Serial
5
Refresh
21600s
Retry
3600s
Expire
259200s
Minimum TTL
300s

Nameservers (NS)

ns-cloud-c2.googledomains.com
ns-cloud-c1.googledomains.com
ns-cloud-c4.googledomains.com
ns-cloud-c3.googledomains.com

SPF Record

✓ Soft Fail (~all)
v=spf1 include:mailgun.org ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✓ 1 found
k1._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: k1

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

All TXT Records

1 record
  • SPFv=spf1 include:mailgun.org ~all
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