Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
tub.co
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-20 03:23:06 UTC · ↺ Refresh
MX Hostnames
- mx.tub.co
MX Priorities
- mx.tub.co: 10
A / AAAA Records
- 202.61.233.57 ↩ ae939.netcup.net
Mail Server IPs
- 130.149.110.191 ↩ mx.tuc.systems
SOA Record
Raw SOA
dns1.registrar-servers.com hostmaster.registrar-servers.com 1772543811 43200 3600 604800 3601
Primary NS (mname)
dns1.registrar-servers.com
Admin Email (rname)
hostmaster@registrar-servers.com
Serial
1772543811
Refresh
43200s
Retry
3600s
Expire
604800s
Minimum TTL
3601s
Nameservers (NS)
dns2.registrar-servers.com
dns1.registrar-servers.com
SPF Record
✓ Strict (-all)
v=spf1 a mx -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; pct=100
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
mail._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: mail
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- SPFv=spf1 a mx -all
- brevo-code:5bfac4276af3aca5f87f4400e7feca17
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