Domain Overview
DNS: ✓ 3d ago
Checker: ✓ 3d ago
cos.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-05-18 10:06:20 UTC · ↺ Refresh
MX Hostnames
- cos-com.mail.protection.outlook.com
MX Priorities
- cos-com.mail.protection.outlook.com: 10
A / AAAA Records
- 23.44.111.14 ↩ a23-44-111-14.deploy.static.akamaitechnologies.com
- 23.44.111.4 ↩ a23-44-111-4.deploy.static.akamaitechnologies.com
- 2600:141b:1c00:16::17c4:31b ↩ g2600-141b-1c00-0016-0000-0000-17c4-031b.deploy.static.akamaitechnologies.com
- 2600:141b:1c00:16::17c4:309 ↩ g2600-141b-1c00-0016-0000-0000-17c4-0309.deploy.static.akamaitechnologies.com
Mail Server IPs
- 52.101.68.15 ↩ mail-db6pr03cu00107.inbound.protection.outlook.com
- 52.101.68.8 ↩ mail-du0pr03cu00100.inbound.protection.outlook.com
- 52.101.73.153 ↩ mail-as8pr05cu00401.inbound.protection.outlook.com
- 52.101.73.11 ↩ mail-am1pr04cu00103.inbound.protection.outlook.com
SOA Record
Raw SOA
a1-139.akam.net hostmaster.hm.com 2019031602 43200 3600 604800 3600
Primary NS (mname)
a1-139.akam.net
Admin Email (rname)
hostmaster@hm.com
Serial
2019031602
Refresh
43200s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
a28-64.akam.net
a12-67.akam.net
a1-139.akam.net
a11-66.akam.net
a5-65.akam.net
a8-66.akam.net
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; fo=1
✓ Reject — strongest protection
📋 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
12 records- google-site-verification=XGUng5eYCF0C100uWIhJOLhOn2g72SN2spVXzRobyf8
- _7yildel6mvm212cw9b4lmm8v5spl14l
- google-site-verification=-kq0iDtXaKOPq4n-ww44XQhV8gd0IyLrNm7yXUTe5Ks
- SPFv=spf1 include:spf.protection.outlook.com -all
- d21k7xlpkvvsr8kb9ftywqjmcsy0cp0z
- facebook-domain-verification=mdjgrcnr6bmhl7ihxkwmdvxw869551
- google-site-verification=jfbF5H4cA7WYHktYArxOp8GF069XuFNeiU0xCVsGwI4
- _cti3dknr9f8p7jnsreq1ufkjjneyimu
- MS=ms86449671
- _2qhm63xkek3l0124exksrfjkasqjwcd
- _rcikfhfracm69zf14wpfll6an91hoss
- pinterest-site-verification=1b4635016fae9948ce19066a974b0974
Full email verification for cos.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits