Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
rgb.com.br
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-23 14:15:55 UTC · ↺ Refresh
MX Hostnames
- mx-us.spfbl.net
- mx-br.spfbl.net
MX Priorities
- mx-br.spfbl.net: 10
- mx-us.spfbl.net: 20
A / AAAA Records
- 179.190.13.200 ↩ rgb21.isbrasil.info
Mail Server IPs
- 52.67.41.212 ↩ mx-br.spfbl.net
- 2600:1f1e:4b3:bd00::8 ↩ mx-br.spfbl.net
- 35.162.4.77 ↩ mx-us.spfbl.net
- 2600:1f14:dfd:4401::8 ↩ mx-us.spfbl.net
SOA Record
Raw SOA
ns-ca.rgbserver.com.br gerenciamento.isbrasil.info 2026020701 3600 1800 1209600 86400
Primary NS (mname)
ns-ca.rgbserver.com.br
Admin Email (rname)
gerenciamento@isbrasil.info
Serial
2026020701
Refresh
3600s
Retry
1800s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-fr.rgbserver.com.br
ns-ca.rgbserver.com.br
SPF Record
✓ Soft Fail (~all)
v=spf1 ip4:179.190.13.200 ip4:167.114.174.198 ip4:66.94.127.127 +mx include:amazonses.com include:spf.leadconnectorhq.com include:mailgun.org ~all
📊 DNS lookups: 4/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;sp=none;adkim=r;aspf=r;pct=100;fo=0;rf=afrf;ri=86400
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
↳ Subdomain policy: none
DKIM Selectors
✓ 3 found
default._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
3 records- SPFv=spf1 ip4:179.190.13.200 ip4:167.114.174.198 ip4:66.94.127.127 +mx include:amazonses.com include:spf.leadconnectorhq.com include:mailgun.org ~all
- google-site-verification=R2CiYxdoVjYx23NnR6eE5zsufhQnPicUa64zFH84S9g
- amazonses:uxMbkvP0u3IB8US86pXMUYSxRpLmEtDuyiOUFFnTusE=
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for rgb.com.br
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits