Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
windowsfirst.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 17:59:47 UTC · ↺ Refresh
MX Hostnames
- windowsfirst-com.mail.protection.outlook.com
MX Priorities
- windowsfirst-com.mail.protection.outlook.com: 0
A / AAAA Records
- 198.185.159.144 (no PTR)
Mail Server IPs
- 52.101.192.0 ↩ mail-yqzpr01cu00900.inbound.protection.outlook.com
- 52.101.190.0 ↩ mail-yt5pr01cu00100.inbound.protection.outlook.com
- 52.101.190.3 ↩ mail-yt6pr01cu00103.inbound.protection.outlook.com
- 52.101.190.1 ↩ mail-yt3pr01cu00701.inbound.protection.outlook.com
- 2a01:111:f403:c942::2 ↩ mail-yt3pr01cu00602.inbound.protection.outlook.com
- 2a01:111:f403:c944:: ↩ mail-yqzpr01cu00900.inbound.protection.outlook.com
- 2a01:111:f403:c942:: ↩ mail-yt5pr01cu00100.inbound.protection.outlook.com
- 2a01:111:f403:c942::1 ↩ mail-yt3pr01cu00701.inbound.protection.outlook.com
SOA Record
Raw SOA
dns1.p06.nsone.net hostmaster.nsone.net 1541897550 43200 7200 1209600 3600
Primary NS (mname)
dns1.p06.nsone.net
Admin Email (rname)
hostmaster@nsone.net
Serial
1541897550
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
3600s
Nameservers (NS)
ns03.squarespacedns.com
ns04.squarespacedns.com
dns1.p06.nsone.net
dns2.p06.nsone.net
dns3.p06.nsone.net
dns4.p06.nsone.net
ns01.squarespacedns.com
ns02.squarespacedns.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo DKIM records found for common selectors — your provider may use a custom selector name.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 include:spf.protection.outlook.com -all
Full email verification for windowsfirst.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits