Domain Overview
DNS: ✓ 2d ago
Checker: ✓ 2d ago
gbabuilders.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-05-19 06:03:35 UTC · ↺ Refresh
MX Hostnames
- gbabuilders-com.mail.protection.outlook.com
MX Priorities
- gbabuilders-com.mail.protection.outlook.com: 0
A / AAAA Records
- 141.193.213.10 (no PTR)
Mail Server IPs
- 52.101.9.26 ↩ mail-bl0pr02cu00702.inbound.protection.outlook.com
- 52.101.9.11 ↩ mail-bl2pr04cu00103.inbound.protection.outlook.com
- 40.93.192.4 ↩ mail-dm2pr04cu00404.inbound.protection.outlook.com
- 52.101.50.4 ↩ mail-co1pr03cu00404.inbound.protection.outlook.com
- 2a01:111:f403:c931:: ↩ mail-sn1pr02cu00100.inbound.protection.outlook.com
- 2a01:111:f403:c927::1 ↩ mail-bn8pr05cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c91d:: ↩ mail-mw2pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f802::1 ↩ mail-sj2pr05cu00101.inbound.protection.outlook.com
SOA Record
Raw SOA
gbmail.gbutler.com postmaster.gbutler.com 2025022001 14400 1800 604800 7200
Primary NS (mname)
gbmail.gbutler.com
Admin Email (rname)
postmaster@gbutler.com
Serial
2025022001
Refresh
14400s
Retry
1800s
Expire
604800s
Minimum TTL
7200s
Nameservers (NS)
auth1.dns.cogentco.com
auth2.dns.cogentco.com
ns.gbutler.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:us._netblocks.mimecast.com include:sendgrid.net include:panteramail.net include:turbo-smtp.com -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; pct=100; rua=mailto:[email protected],mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 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- 3265801
- 2c6vqdqp707vr4mip1a2lifvqc
- m95r6rcpshbeg2h96mk3dcrm1b
- ZOOM_verify_lkb9_qUHScShLQPlluvo-A
- 6AKUPzqlLa3V9MOtQj8KXFMlHbNz9fE9iv+dbpWzggndx+Z/xvVyrwwWQoZ/2aReDAKYxwQVrY5gfYEVCRxh2A==
- SPFv=spf1 include:spf.protection.outlook.com include:us._netblocks.mimecast.com include:sendgrid.net include:panteramail.net include:turbo-smtp.com -all
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 gbabuilders.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits