Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
responsibledisclosure.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-26 13:20:08 UTC · ↺ Refresh
MX Hostnames
- mailstream-east.mxrecord.io
- mailstream-west.mxrecord.io
MX Priorities
- mailstream-west.mxrecord.io: 10
- mailstream-east.mxrecord.io: 10
A / AAAA Records
No A/AAAA records found.
Mail Server IPs
- 172.65.220.210 (no PTR)
- 172.65.213.128 (no PTR)
SOA Record
Raw SOA
ns-cloud-b1.googledomains.com cloud-dns-hostmaster.google.com 1 21600 3600 259200 300
Primary NS (mname)
ns-cloud-b1.googledomains.com
Admin Email (rname)
cloud-dns-hostmaster@google.com
Serial
1
Refresh
21600s
Retry
3600s
Expire
259200s
Minimum TTL
300s
Nameservers (NS)
ns-cloud-b1.googledomains.com
ns-cloud-b3.googledomains.com
ns-cloud-b4.googledomains.com
ns-cloud-b2.googledomains.com
SPF Record
✓ Strict (-all)
v=spf1 include:_spf.google.com include:mail.zendesk.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected];
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
google._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: google
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 include:_spf.google.com include:mail.zendesk.com -all
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