s21sec.com

Valid Email Server
Domain Lookup › s21sec.com
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
s21sec.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-09-23 07:06:43 UTC · ↺ Refresh

Add email validation to your forms — free

Add our free script to block 10,000+ disposable domains + perform other checks. No signup, unlimited checks.

MX validation Disposable detection Role accounts
Add to your signup form
<script src="https://check.verifyswift.com/"></script>
One line · No registration · See full docs & demo → · Customize →

MX Hostnames

  • alt2.emea.email.fireeyecloud.com
  • primary.emea.email.fireeyecloud.com
  • alt1.emea.email.fireeyecloud.com

MX Priorities

  • alt1.emea.email.fireeyecloud.com: 20
  • alt2.emea.email.fireeyecloud.com: 30
  • primary.emea.email.fireeyecloud.com: 10

A / AAAA Records

No A/AAAA records found.

Mail Server IPs

  • 63.34.218.9 ↩ mx.emea.email.fireeyecloud.com
  • 63.34.218.11 ↩ mx.emea.email.fireeyecloud.com
  • 3.123.5.9 ↩ mx.emea.email.fireeyecloud.com
  • 3.123.5.10 ↩ mx.emea.email.fireeyecloud.com
  • 3.123.5.11 ↩ mx.emea.email.fireeyecloud.com
  • 63.34.218.10 ↩ mx.emea.email.fireeyecloud.com

SOA Record

Raw SOA ns1-01.azure-dns.com azuredns-hostmaster.microsoft.com 2020112308 300 300 2419200 300
Primary NS (mname)
ns1-01.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
2020112308
Refresh
300s
Retry
300s
Expire
2419200s
Minimum TTL
300s

Nameservers (NS)

ns4-01.azure-dns.info
ns1-01.azure-dns.com
ns2-01.azure-dns.net
ns3-01.azure-dns.org

SPF Record

✓ Strict (-all)
v=spf1 ip4:88.84.64.14/32 include:spf.protection.outlook.com include:_spf.thalesgroup.com mx -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

~ Quarantine
v=DMARC1;p=quarantine;sp=quarantine;np=reject;rf=afrf;ri=86400;fo=1;rua=mailto:[email protected];ruf=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine

DKIM Selectors

✓ 1 found
dkim._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: dkim

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

All TXT Records

7 records
  • SPFv=spf1 ip4:88.84.64.14/32 include:spf.protection.outlook.com include:_spf.thalesgroup.com mx -all
  • d365mktkey=3q2u1bmqkdil8lqmo4h633l0i
  • apple-domain-verification=UxAnh0Dlq0XO5f7m
  • q2j0qydls29qljc53gjb5j8gv0jmq2vn
  • google-site-verification=rRUkfo1NX9Z7eKXdfyE_rZDP8NqXaoafr71sr1x6GFY
  • google-site-verification=KpQEFoUX4HjLLSrAppJaeT9vabUZ9kBXUm7hZTQukvk
  • _izxu5x044cy6quuo8h8wa2fnsjpkwqi
Free · No signup required
Add email validation to your forms

Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.

<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site · Customize →
See demo & docs
Deep verification
Full email verification for s21sec.com

SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.

No credit card required
Get 1,000 Free Credits