Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
coolblew.com
Yes
✓ Yes
Barracuda
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 04:02:18 UTC · ↺ Refresh
MX Hostnames
- d160678b.ess.barracudanetworks.com
- d160678a.ess.barracudanetworks.com
MX Priorities
- d160678a.ess.barracudanetworks.com: 1
- d160678b.ess.barracudanetworks.com: 1
A / AAAA Records
- 172.67.200.21 (no PTR)
- 104.21.21.199 (no PTR)
- 2606:4700:3031::6815:15c7 (no PTR)
- 2606:4700:3037::ac43:c815 (no PTR)
Mail Server IPs
- 209.222.82.252 ↩ mail.ess.barracuda.com
- 209.222.82.255 ↩ mail.ess.barracuda.com
- 209.222.82.253 ↩ mail.ess.barracuda.com
SOA Record
Raw SOA
jamie.ns.cloudflare.com dns.cloudflare.com 2399275821 10000 2400 604800 1800
Primary NS (mname)
jamie.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2399275821
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
ray.ns.cloudflare.com
jamie.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:173.231.200.236 +a +mx +ip4:205.134.250.206 include:spf.protection.outlook.com include:spf.ess.barracudanetworks.com include:sendgrid.net include:mailgun.org -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;sp=reject;adkim=r;aspf=r;pct=100;fo=0;rf=afrf;ri=86400; rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
DKIM Selectors
✓ 3 found
selector1._domainkey
selector2._domainkey
default._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
2 records- brevo-code:8734af8715981721093e36e1328af601
- SPFv=spf1 ip4:173.231.200.236 +a +mx +ip4:205.134.250.206 include:spf.protection.outlook.com include:spf.ess.barracudanetworks.com include:sendgrid.net include:mailgun.org -all
Full email verification for coolblew.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits