Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
buildersfirstsource.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-19 04:51:44 UTC · ↺ Refresh
MX Hostnames
- buildersfirstsource-com.mail.protection.outlook.com
MX Priorities
- buildersfirstsource-com.mail.protection.outlook.com: 5
A / AAAA Records
- 40.117.138.103 (no PTR)
Mail Server IPs
- 52.101.41.180 ↩ mail-byapr04cu00204.inbound.protection.outlook.com
- 52.101.8.51 ↩ mail-dm1pr04cu00203.inbound.protection.outlook.com
- 52.101.41.54 ↩ mail-sj2pr05cu00506.inbound.protection.outlook.com
- 52.101.50.1 ↩ mail-co1pr05cu00401.inbound.protection.outlook.com
- 2a01:111:f403:f90d:: ↩ mail-sn1pr0501cu00200.inbound.protection.outlook.com
- 2a01:111:f403:c92c::3 ↩ mail-dm5pr04cu00103.inbound.protection.outlook.com
- 2a01:111:f403:c946::6 ↩ mail-ch5pr02cu00406.inbound.protection.outlook.com
- 2a01:111:f403:f802::2 ↩ mail-sj2pr05cu00202.inbound.protection.outlook.com
SOA Record
Raw SOA
udns1.cscdns.net hostmaster.cscdns.net 2024070945 86400 86400 86400 60
Primary NS (mname)
udns1.cscdns.net
Admin Email (rname)
hostmaster@cscdns.net
Serial
2024070945
Refresh
86400s
Retry
86400s
Expire
86400s
Minimum TTL
60s
Nameservers (NS)
udns1.cscdns.net
udns2.cscdns.uk
SPF Record
✓ Soft Fail (~all)
v=spf1 include:spf.protection.outlook.com ip4:104.143.112.57 ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ p=none
v=DMARC1;p=none;rua=mailto:[email protected];ruf=mailto:[email protected];sp=none;fo=1:d;
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: none
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._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
8 records- h8fTbhVQxoPWjfnHl6lAeF3Pn1SJDXKK32e/C1FsKv086ETVT5bFDJDlMvEuBxSTkNZtfMGtHlShpv9JYqh0KQ==
- MS=ms69559737
- bldr.azurewebsites.net
- P20ZAL2EHV6DXFX7MU6DW7YQZR7AXSJLR7X2DTR5
- docusign=e31b3319-04d6-428b-8e6e-ca6e1f35f323
- knowbe4-site-verification=604c26ea69550073eea75bf697e7dcb6
- SPFv=spf1 include:spf.protection.outlook.com ip4:104.143.112.57 ~all
- S1lYzwPjnGtxwVD/f3Qv/bv5/uRSma5XmcWE6NP0i/z/Hg8py6mTN7Gcbt3HgzXKG8vvooAmFp1kJG9TE7bWNg==
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 buildersfirstsource.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits