Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
rkf.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-18 10:19:23 UTC · ↺ Refresh
MX Hostnames
- rkf-com.mail.protection.outlook.com
MX Priorities
- rkf-com.mail.protection.outlook.com: 10
A / AAAA Records
- 69.55.231.243 ↩ www.rkf.com
Mail Server IPs
- 40.93.192.4 ↩ mail-dm2pr04cu00404.inbound.protection.outlook.com
- 52.101.10.12 ↩ mail-bn1pr21cu00204.inbound.protection.outlook.com
- 52.101.40.0 ↩ mail-cy5pr03cu00300.inbound.protection.outlook.com
- 52.101.41.4 ↩ mail-sj2pr05cu00204.inbound.protection.outlook.com
- 2a01:111:f403:c802:: ↩ mail-cy4pr03cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f90f::1 ↩ mail-sa9pr04cu00201.inbound.protection.outlook.com
- 2a01:111:f403:f90d:: ↩ mail-sn1pr0501cu00200.inbound.protection.outlook.com
- 2a01:111:f403:c902::16 ↩ mail-byapr04cu00306.inbound.protection.outlook.com
SOA Record
Raw SOA
blue.foundationdns.com webdomainadmin.cantor.com 61 10800 3600 2419200 900
Primary NS (mname)
blue.foundationdns.com
Admin Email (rname)
webdomainadmin@cantor.com
Serial
61
Refresh
10800s
Retry
3600s
Expire
2419200s
Minimum TTL
900s
Nameservers (NS)
blue.foundationdns.com
blue.foundationdns.net
blue.foundationdns.org
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com ip4:69.55.231.243 -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1;p=reject;rua=mailto:[email protected];ruf=mailto:[email protected];fo=1
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
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
4 records- box-domain-verification=f398f9e611e2ee1666799c441e616c30a94d3535e2f10d0a9806d583698c03ba
- SPFv=spf1 include:spf.protection.outlook.com ip4:69.55.231.243 -all
- MS=ms93307084
- ZOOM_verify_3IEbIen38Kakh26T4aSTJ6
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 rkf.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits