corestaff.com

Valid Email Server
Domain Lookup › corestaff.com

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
corestaff.com
Yes
✓ Yes
Google
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-17 23:16:08 UTC · ↺ Refresh

MX Hostnames

  • aspmx.l.google.com
  • alt3.aspmx.l.google.com
  • alt1.aspmx.l.google.com
  • alt4.aspmx.l.google.com
  • alt2.aspmx.l.google.com

MX Priorities

  • alt2.aspmx.l.google.com: 5
  • aspmx.l.google.com: 1
  • alt3.aspmx.l.google.com: 10
  • alt4.aspmx.l.google.com: 10
  • alt1.aspmx.l.google.com: 5

A / AAAA Records

  • 51.132.56.43

Mail Server IPs

  • 172.253.116.26 ↩ dj-in-f26.1e100.net
  • 2a00:1450:400b:c02::1b ↩ dj-in-f27.1e100.net
  • 172.253.63.27 ↩ bi-in-f27.1e100.net
  • 2607:f8b0:4004:c0b::1a ↩ bj-in-f26.1e100.net
  • 192.178.223.26 ↩ yulhrs-in-f26.1e100.net
  • 2a00:1450:4009:c0f::1b ↩ yulhrs-in-f27.1e100.net
  • 173.194.76.27 ↩ ws-in-f27.1e100.net
  • 2a00:1450:400c:c00::1a ↩ ws-in-f26.1e100.net
  • 108.177.123.27 ↩ lcscld-in-f27.1e100.net
  • 2800:3f0:4003:c0f::1a (no PTR)

SOA Record

Raw SOA ns-1590.awsdns-06.co.uk awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-1590.awsdns-06.co.uk
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

ns-650.awsdns-17.net
ns-7.awsdns-00.com
ns-1488.awsdns-58.org
ns-1590.awsdns-06.co.uk

SPF Record

✓ Soft Fail (~all)
v=spf1 ip4:81.144.251.100/32 ip4:212.38.90.227/32 ip4:217.33.166.36/32 ip4:5.148.154.112/28 ip4:5.148.154.96/28 include:spf.protection.outlook.com include:mail.zendesk.com include:_spf.google.com ~all
📊 DNS lookups: 3/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✓ 2 found
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: s1

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

11 records
  • 1hdn70bjtoms6ijv358c45qsqn
  • MS=ms12784546
  • google-site-verification=oSMvZ3Kjr1BhVb4kc8g8RBZOvDRaelvcW8b9c3cLCBI
  • hg526b8cmpve6q8a0lc47ssfm8
  • j1h7uQr02u9lj9PJbyaWGHwwHS89Oph0gHcwTRw+K4QQn7ER0h26gbK7qlnytSGR+edzK43lPjgV63PSkkcb6w==
  • j9i5rs3im42e5v3hcc36utdrj2
  • knowbe4-site-verification=77e94380005e68716f7b6cb24fb7bbe7
  • lHHDmkv7Sl2O0OwYwOM+nKg4ztf2APwI9Mq4fVoUd/1CqjeLKFu+eYzZ4lkOkLXyWkNFX5PxGEwQyiYtDMYedA==
  • sBEPClpOXc+vZfUGTq227aQ4CHwfJET/nr9SL+Sm5ecrKgcGXKzCR6FWxEdG3PPWw9BvrJDkKYnzFQ32Pc3yzA==
  • SPFv=spf1 ip4:81.144.251.100/32 ip4:212.38.90.227/32 ip4:217.33.166.36/32 ip4:5.148.154.112/28 ip4:5.148.154.96/28 include:spf.protection.outlook.com include:mail.zendesk.com include:_spf.google.com ~all
  • workplace-domain-verification=dHpKUf8rhvS4OnzE0McFuVuOxZuWve
Full email verification for corestaff.com

Run SMTP check, SPF/DKIM/DMARC and catch-all detection.

SPF / DKIM / DMARC Get 1,000 Free Credits