Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
foursys.com.br
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-02 10:55:05 UTC · ↺ Refresh
MX Hostnames
- foursys-com-br.mail.protection.outlook.com
MX Priorities
- foursys-com-br.mail.protection.outlook.com: 10
A / AAAA Records
- 104.26.5.34 (no PTR)
- 172.67.72.35 (no PTR)
- 104.26.4.34
- 2606:4700:20::681a:522
- 2606:4700:20::681a:422
- 2606:4700:20::ac43:4823
Mail Server IPs
- 52.101.50.4 ↩ mail-co1pr03cu00404.inbound.protection.outlook.com
- 52.101.9.12 ↩ mail-bl0pr05cu00504.inbound.protection.outlook.com
- 52.101.11.3 ↩ mail-sn1pr0501cu00103.inbound.protection.outlook.com
- 52.101.41.21 ↩ mail-sj2pr05cu00305.inbound.protection.outlook.com
- 2a01:111:f403:c946::3 ↩ mail-ch0pr04cu00603.inbound.protection.outlook.com
- 2a01:111:f403:c91d:: ↩ mail-mw2pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:c91d::b ↩ mail-mw2pr02cu00603.inbound.protection.outlook.com
- 2a01:111:f403:c92c::4 ↩ mail-dm6pr05cu00404.inbound.protection.outlook.com
SOA Record
Raw SOA
colin.ns.cloudflare.com dns.cloudflare.com 2400363023 10000 2400 604800 1800
Primary NS (mname)
colin.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2400363023
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
kiki.ns.cloudflare.com
colin.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:mxsspf.sendpulse.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
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
6 records- apple-domain-verification=wSAdBsOlNoyVBcci
- g2r0mogvjlmicu5c6q6mnsh7kh
- google-site-verification=VtMckf75lw3d3-q9BlNRfjJ3MVMtLrjL7RYjdIFMcxg
- SPFv=spf1 include:spf.protection.outlook.com include:mxsspf.sendpulse.com -all
- 66wjjcyplrltxshbjjr2yr9j1fg9qh8c
- _7nbsgfs5yytc3fh59bo4ysbl6eb3lek
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 foursys.com.br
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits