Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
corasystems.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 19:56:53 UTC · ↺ Refresh
MX Hostnames
- corasystems-com.mail.protection.outlook.com
MX Priorities
- corasystems-com.mail.protection.outlook.com: 0
A / AAAA Records
- 76.76.21.21 (no PTR)
Mail Server IPs
- 52.101.73.4 ↩ mail-am0pr83cu00404.inbound.protection.outlook.com
- 52.101.73.8 ↩ mail-am0pr04cu00500.inbound.protection.outlook.com
- 52.101.68.5 ↩ mail-du2pr03cu00105.inbound.protection.outlook.com
- 52.101.73.24 ↩ mail-as8pr05cu00300.inbound.protection.outlook.com
- 2a01:111:f403:ca09::d ↩ mail-as9pr05cu01305.inbound.protection.outlook.com
- 2a01:111:f403:ca04::8 ↩ mail-db5pr02cu00100.inbound.protection.outlook.com
- 2a01:111:f403:ca09:: ↩ mail-am3pr04cu00500.inbound.protection.outlook.com
- 2a01:111:f403:ca09::6 ↩ mail-am4pr0401cu00106.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1-07.azure-dns.com azuredns-hostmaster.microsoft.com 1 3600 300 2419200 300
Primary NS (mname)
ns1-07.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
1
Refresh
3600s
Retry
300s
Expire
2419200s
Minimum TTL
300s
Nameservers (NS)
ns2-07.azure-dns.net
ns3-07.azure-dns.org
ns4-07.azure-dns.info
ns1-07.azure-dns.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf1.corasystems.com include:spf2.corasystems.com include:spf3.corasystems.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; pct=10; rua=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
⚠ Policy applies to 10% of failing messages only
DKIM Selectors
✓ 2 found
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: s1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
4 records- apple-domain-verification=JB5emruA5MawcB3X
- SPFv=spf1 include:spf1.corasystems.com include:spf2.corasystems.com include:spf3.corasystems.com -all
- google-site-verification=yDOZ0J-aoNkFQWWzVhz1FWXhmMEuse0Mz_Wj3dKp3Yk
- atlassian-domain-verification=Q40FAUOnapPwFislWFrzdHxZlxBx7bEpyEz/dLRTWC6unt9aR8nkkEhwJsshnjTh
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