Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
houston.org
Yes
✓ Yes
Barracuda
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 08:40:45 UTC · ↺ Refresh
MX Hostnames
- d153788b.ess.barracudanetworks.com
- d153788a.ess.barracudanetworks.com
MX Priorities
- d153788b.ess.barracudanetworks.com: 10
- d153788a.ess.barracudanetworks.com: 0
A / AAAA Records
- 23.185.0.1 (no PTR)
- 2620:12a:8001::1 (no PTR)
- 2620:12a:8000::1 (no PTR)
Mail Server IPs
- 209.222.82.253 ↩ mail.ess.barracuda.com
- 209.222.82.252 ↩ mail.ess.barracuda.com
- 209.222.82.255 ↩ mail.ess.barracuda.com
SOA Record
Raw SOA
ns0.dnsmadeeasy.com dns.dnsmadeeasy.com 2008010745 43200 3600 1209600 180
Primary NS (mname)
ns0.dnsmadeeasy.com
Admin Email (rname)
dns@dnsmadeeasy.com
Serial
2008010745
Refresh
43200s
Retry
3600s
Expire
1209600s
Minimum TTL
180s
Nameservers (NS)
ns3.dnsmadeeasy.com
ns4.dnsmadeeasy.com
ns0.dnsmadeeasy.com
ns1.dnsmadeeasy.com
ns2.dnsmadeeasy.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:12.39.191.176/29 include:spf.protection.outlook.com include:_spf.salesforce.com include:_spf.psm.knowbe4.com include:spf.ess.barracudanetworks.com include:mailgun.org -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; sp=reject; aspf=r; adkim=r; pct=100; rua=mailto:[email protected]; fo=1; ri=86400
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
6 records- SPFv=spf1 ip4:12.39.191.176/29 include:spf.protection.outlook.com include:_spf.salesforce.com include:_spf.psm.knowbe4.com include:spf.ess.barracudanetworks.com include:mailgun.org -all
- google-gws-recovery-domain-verification=59913919
- openai-domain-verification=dv-NZyDeuqSmbIxxumZWsD9IhV2
- google-site-verification=vbOajxqfSOF-j1uL7ijOOsQAm8_6FrattGclgoKSF18
- google-site-verification=oCIvQGfMVpmITaXVV8Udzi_v6suDIJRbsVHxeuxwH0A
- apple-domain-verification=hGCYECJiqO0NKAqM
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
See demo & docs
Deep verification
Full email verification for houston.org
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits