Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
blackduck.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-04 23:13:39 UTC · ↺ Refresh
MX Hostnames
- blackduck-com.mail.protection.outlook.com
MX Priorities
- blackduck-com.mail.protection.outlook.com: 10
A / AAAA Records
- 104.18.38.192 (no PTR)
- 172.64.149.64 (no PTR)
Mail Server IPs
- 52.101.41.180 ↩ mail-byapr04cu00204.inbound.protection.outlook.com
- 52.101.9.24 ↩ mail-bl2pr02cu00400.inbound.protection.outlook.com
- 52.101.9.12 ↩ mail-bl0pr05cu00504.inbound.protection.outlook.com
- 52.101.41.4 ↩ mail-sj2pr05cu00204.inbound.protection.outlook.com
- 2a01:111:f403:f90f::1 ↩ mail-sa9pr04cu00201.inbound.protection.outlook.com
- 2a01:111:f403:c902::3 ↩ mail-sj0pr03cu01703.inbound.protection.outlook.com
- 2a01:111:f403:f804::1 ↩ mail-co1pr05cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c802:: ↩ mail-cy4pr03cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
ns10.digicertdns.com dns.digicertdns.com 2009010389 43200 3600 1209600 180
Primary NS (mname)
ns10.digicertdns.com
Admin Email (rname)
dns@digicertdns.com
Serial
2009010389
Refresh
43200s
Retry
3600s
Expire
1209600s
Minimum TTL
180s
Nameservers (NS)
ns2.dnsmadeeasy.com
ns1.dnsmadeeasy.com
ns0.dnsmadeeasy.com
ns3.dnsmadeeasy.com
ns4.dnsmadeeasy.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:mktomail.com include:_spf.salesforce.com include:mail.zendesk.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected];
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
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
16 records- jetbrains-domain-verification=3drzplo318rpsu76me638vtbv
- google-site-verification=Euh3nf9zCUIv0Foo25Pddp07QYubfBWicbre-HQRzGk
- google-site-verification=pOXGDzu8MIjL16aMWfp9Fb8tCvsUEo80tcxlkTbTlgA
- new-relic-domain-verification=5561999d9e2f41e8838830b85d00c000
- anthropic-domain-verification-szzs8x=NevL0HC6rgcJg4VzZT48Wr8Vu
- apple-domain-verification=sIzhNXmkIxsVdYxU
- MS=ms22819795
- atlassian-domain-verification=ERQGj3m0yJJNdWHguGYiKIvWSPbcE5n0EntUhRaDlJEXVWNodORcDBKpbPe4atmk
- jamf-site-verification=ZOis-yL9s99IbhdiUpDHbQ
- google-gws-recovery-domain-verification=56376261
- postman-domain-verification=99a1f29f96ad26f118ac5112610221dc042213dbd3a6a05292ba0e3fcf6e75a263033136c9a34a90a68126293b44ec6cfd7252f453d2e2d97dec39c4d9f25fcd
- SPFv=spf1 include:spf.protection.outlook.com include:mktomail.com include:_spf.salesforce.com include:mail.zendesk.com -all
- atlassian-domain-verification=GqyibgPiaXhOERsot4TRzihsTmsusxwuzsX5lOONRQCMVDaAa2gXQ4PoR/W8za/N
- neat-pulse-domain-verification-7M1lBRX=0a7e8c52-25ec-4631-9da7-7676175bb382
- google-site-verification=Ydo-NBCjNifIGZ7cgcEr_v-j_Rm3ADuMF0dJ9gVwGWA
- google-site-verification=PiVgR0EV92zpLLwSj-J1y-CgS6t3hynxIRvNv_tE0O4
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 blackduck.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits