columbiatech.com

Valid Email Server
Domain Lookup › columbiatech.com

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
columbiatech.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-04-02 06:07:58 UTC · ↺ Refresh

MX Hostnames

  • us-smtp-inbound-1.mimecast.com
  • us-smtp-inbound-2.mimecast.com

MX Priorities

  • us-smtp-inbound-1.mimecast.com: 10
  • us-smtp-inbound-2.mimecast.com: 10

A / AAAA Records

  • 141.193.213.10 (no PTR)

Mail Server IPs

  • 170.10.132.221 ↩ us-smtp-inbound-2.mimecast.com
  • 170.10.128.221 ↩ us-smtp-inbound-2.mimecast.com
  • 170.10.128.242 ↩ us-smtp-inbound-1.mimecast.com
  • 170.10.132.242 ↩ us-smtp-inbound-1.mimecast.com
  • 170.10.132.141 ↩ us-smtp-inbound-2.mimecast.com
  • 170.10.128.141 ↩ us-smtp-inbound-2.mimecast.com

SOA Record

Raw SOA ns11.constellix.com dns.constellix.com 2015010121 43200 3600 1209600 180
Primary NS (mname)
ns11.constellix.com
Admin Email (rname)
dns@constellix.com
Serial
2015010121
Refresh
43200s
Retry
3600s
Expire
1209600s
Minimum TTL
180s

Nameservers (NS)

ns41.constellix.net
ns51.constellix.net
ns61.constellix.net
ns11.constellix.com
ns21.constellix.com
ns31.constellix.com

SPF Record

✓ Strict (-all)
v=spf1 mx include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:spf.exclaimer.net ip4:69.26.100.35 -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;
✓ Reject — strongest protection
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

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

All TXT Records

4 records
  • SPFv=spf1 mx include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:spf.exclaimer.net ip4:69.26.100.35 -all
  • TNvzJ2EX9k5Tt8QdaePxcnHVrvnlaONIhU0V3UV9ABlvLpAV0BjFkbQQRaG3sWvBNPuP0H/vP/uOEk14rsJAWw==
  • MS=ms14135610
  • atlassian-domain-verification=gM1PHkffyZgFJNKhviJ7jpaFbj2rpKV4/J3ujpENDSfWv6QCbcjJKJCZBkYJsoa9
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