johnsoncmu.com

Valid Email Server
Domain Lookup › johnsoncmu.com

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
johnsoncmu.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-26 08:30:18 UTC · ↺ Refresh

MX Hostnames

  • johnsoncmu-com.mail.protection.outlook.com

MX Priorities

  • johnsoncmu-com.mail.protection.outlook.com: 0

A / AAAA Records

  • 185.206.180.117 ↩ 6.http-proxy2.cloudns.net
  • 185.206.180.179 ↩ 179.http4.cloudns.net
  • 2a0b:1640:1:1:1:1:bb7:e646
  • 2a0b:1640:1:1:1004:1:1:1

Mail Server IPs

  • 52.101.11.2 ↩ mail-sn1pr03cu00102.inbound.protection.outlook.com
  • 52.101.41.54 ↩ mail-sj2pr05cu00506.inbound.protection.outlook.com
  • 52.101.9.20 ↩ mail-bl0pr02cu00604.inbound.protection.outlook.com
  • 52.101.9.0 ↩ mail-bl2pr02cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:c946::2 ↩ mail-ch4pr04cu00102.inbound.protection.outlook.com
  • 2a01:111:f403:f901:: ↩ mail-mn2pr04cu00200.inbound.protection.outlook.com
  • 2a01:111:f403:f905::3 ↩ mail-dm5pr02cu00203.inbound.protection.outlook.com
  • 2a01:111:f403:f913:: ↩ mail-cy1pr03cu00100.inbound.protection.outlook.com

SOA Record

Raw SOA dns1.cloudns.net support.cloudns.net 2026030601 7200 1800 1209600 3600
Primary NS (mname)
dns1.cloudns.net
Admin Email (rname)
support@cloudns.net
Serial
2026030601
Refresh
7200s
Retry
1800s
Expire
1209600s
Minimum TTL
3600s

Nameservers (NS)

dns5.cloudns.net
dns1.cloudns.net
dns2.cloudns.net
dns6.cloudns.net

SPF Record

✓ Strict (-all)
v=spf1 include:spf.smtp2go.com include:spf.protection.outlook.com ip4:8.25.238.197 ip:66.57.179.82 -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✓ 2 found
selector1._domainkey
selector2._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

2 records
  • SPFv=spf1 include:spf.smtp2go.com include:spf.protection.outlook.com ip4:8.25.238.197 ip:66.57.179.82 -all
  • MS=ms16872459
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