Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
houstonfirst.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-22 22:23:25 UTC · ↺ Refresh
MX Hostnames
- houstonfirst-com.mail.protection.outlook.com
MX Priorities
- houstonfirst-com.mail.protection.outlook.com: 0
A / AAAA Records
- 45.33.118.218 ↩ li1055-218.members.linode.com
Mail Server IPs
- 52.101.9.14 ↩ mail-bl0pr03cu00206.inbound.protection.outlook.com
- 52.101.10.1 ↩ mail-bn6pr02cu00301.inbound.protection.outlook.com
- 52.101.9.2 ↩ mail-mn2pr02cu00202.inbound.protection.outlook.com
- 52.101.11.10 ↩ mail-sa9pr03cu00202.inbound.protection.outlook.com
- 2a01:111:f403:c803:: ↩ mail-bn1pr21cu00200.inbound.protection.outlook.com
- 2a01:111:f403:f90f::1 ↩ mail-sa9pr04cu00201.inbound.protection.outlook.com
- 2a01:111:f403:f805::1 ↩ mail-co1pr03cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c92c::2 ↩ mail-dm2pr04cu00102.inbound.protection.outlook.com
SOA Record
Raw SOA
ns77.domaincontrol.com dns.jomax.net 2026030500 28800 7200 604800 600
Primary NS (mname)
ns77.domaincontrol.com
Admin Email (rname)
dns@jomax.net
Serial
2026030500
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns78.domaincontrol.com
ns77.domaincontrol.com
SPF Record
✓ Strict (-all)
v=spf1 include:autotask.net include:spf.protection.outlook.com ip4:66.78.231.27 ip4:66.78.231.1 include:spf-a.houstonfirst.com include:spf-b.houstonfirst.com -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 3 found
selector1._domainkey
selector2._domainkey
k1._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
4 records- hes=4da9cac4b9e883ca5aea3fd9cfb53756
- 6b08551d6728588a847d7bad12911981fe9bee0e27156910f8
- SPFv=spf1 include:autotask.net include:spf.protection.outlook.com ip4:66.78.231.27 ip4:66.78.231.1 include:spf-a.houstonfirst.com include:spf-b.houstonfirst.com -all
- facebook-domain-verification=r4z3rxg5jg0jozq3wvts8soehbm0gv
Full email verification for houstonfirst.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits