Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
rcsdk12.org
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-21 01:13:11 UTC · ↺ Refresh
MX Hostnames
- rcsdk12-org.mail.protection.outlook.com
MX Priorities
- rcsdk12-org.mail.protection.outlook.com: 0
A / AAAA Records
- 104.17.71.73 (no PTR)
Mail Server IPs
- 52.101.41.26 ↩ mail-sj0pr03cu01702.inbound.protection.outlook.com
- 52.101.41.21 ↩ mail-sj2pr05cu00305.inbound.protection.outlook.com
- 52.101.9.20 ↩ mail-bl0pr02cu00604.inbound.protection.outlook.com
- 52.101.11.15 ↩ mail-sa9pr02cu00207.inbound.protection.outlook.com
- 2a01:111:f403:c801:: ↩ mail-sa9pr02cu00200.inbound.protection.outlook.com
- 2a01:111:f403:c901::1 ↩ mail-bl2pr04cu00201.inbound.protection.outlook.com
- 2a01:111:f403:f90f:: ↩ mail-sa9pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f902::2 ↩ mail-mn2pr02cu00202.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1-32.azure-dns.com root.ns1 202206231 300 600 604800 3600
Primary NS (mname)
ns1-32.azure-dns.com
Admin Email (rname)
root@ns1
Serial
202206231
Refresh
300s
Retry
600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns3-32.azure-dns.org
ns4-32.azure-dns.info
ns1-32.azure-dns.com
ns2-32.azure-dns.net
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:_spf.google.com include:spf.schoolwires.net include:customerspf.schoolmessenger.com ip4:23.190.208.26 ip4:23.190.208.27 ip4:23.190.208.28 ip4:12.171.93.123 ip4:23.190.208.100 -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected];
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → 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
10 records- SPFv=spf1 include:spf.protection.outlook.com include:_spf.google.com include:spf.schoolwires.net include:customerspf.schoolmessenger.com ip4:23.190.208.26 ip4:23.190.208.27 ip4:23.190.208.28 ip4:12.171.93.123 ip4:23.190.208.100 -all
- b2085gs7a60eieot8k4p7gtu9
- cg40rqr9oqc3jgg53088rdbn1n
- hlg4jbcgch9hd97ckr6m9ne6j5
- apple-domain-verification=YVBAezdEOiZJHzvR
- openai-domain-verification=dv-WeemAn0cWaxhJUxbZroLSoYz
- google-site-verification=Z1bIC83qHq69eHxWcogmkjQEG0z_J5ani7xoyHP52YA
- atlassian-sending-domain-verification=cf010c43-52d9-4fef-b6cb-65f50baf0421
- adobe-idp-site-verification=1f3cdd4da26ed1f89a518be63bce9968de504e6ec2e812d2681e551e542c0fd8
- atlassian-domain-verification=9RzU5WseJcfvkL5HfjUlCtg4Rg3YUOfkWleD8W9ySb74BAOx0MCsyGCszfdxa0gU
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 rcsdk12.org
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits