tc.columbia.edu

Valid Email Server
Domain Lookup › tc.columbia.edu
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
tc.columbia.edu
Yes
✓ Yes
Google
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-30 08:00:25 UTC · ↺ Refresh

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MX Hostnames

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

MX Priorities

  • alt3.aspmx.l.google.com: 100
  • alt2.aspmx.l.google.com: 50
  • alt1.aspmx.l.google.com: 50
  • aspmx.l.google.com: 10
  • alt4.aspmx.l.google.com: 100

A / AAAA Records

  • 34.196.195.67

Mail Server IPs

  • 192.178.223.26 ↩ yulhrs-in-f26.1e100.net
  • 2a00:1450:4009:c0f::1b ↩ yulhrs-in-f27.1e100.net
  • 172.253.116.27 ↩ dj-in-f27.1e100.net
  • 2a00:1450:400b:c02::1a ↩ dj-in-f26.1e100.net
  • 108.177.123.27 ↩ lcscld-in-f27.1e100.net
  • 2800:3f0:4003:c0f::1a (no PTR)
  • 142.250.31.26 ↩ bj-in-f26.1e100.net
  • 2607:f8b0:4004:c21::1b ↩ pe-in-f27.1e100.net
  • 173.194.76.26 ↩ ws-in-f26.1e100.net
  • 2a00:1450:400c:c00::1a ↩ ws-in-f26.1e100.net

SOA Record

No SOA record found.

Nameservers (NS)

No nameservers found.

SPF Record

✓ Soft Fail (~all)
v=spf1 ip4:204.93.202.186 ip4:128.59.72.0/24 ip4:34.198.225.191 ip4:160.39.80.91 ip4:160.39.80.98 ip4:34.198.91.107 ip4:160.39.80.107 ip4:160.39.80.196 ip4:204.168.144.51 ip4:3.232.18.189 ip4:104.45.175.206 ip4:52.224.142.128 ip4:64.74.237.230/31 ip4:216.147.212.20/30 include:_spf.google.com include:_spf.qualtrics.com include:servers.mcsv.net include:_spf.academicworks.com ~all
📊 DNS lookups: 4/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ p=none
v=DMARC1; p=none; sp=none; fo=1; ri=3600; rua=mailto:[email protected]; ruf=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: none

DKIM Selectors

✓ 4 found
google._domainkey
k1._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: google

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

All TXT Records

10 records
  • bw=xehmAKNEgoJ6EG91oo6y76ya62vuvEUCCUDFwLc00MNH
  • SPFv=spf1 ip4:204.93.202.186 ip4:128.59.72.0/24 ip4:34.198.225.191 ip4:160.39.80.91 ip4:160.39.80.98 ip4:34.198.91.107 ip4:160.39.80.107 ip4:160.39.80.196 ip4:204.168.144.51 ip4:3.232.18.189 ip4:104.45.175.206 ip4:52.224.142.128 ip4:64.74.237.230/31 ip4:216.147.212.20/30 include:_spf.google.com include:_spf.qualtrics.com include:servers.mcsv.net include:_spf.academicworks.com ~all
  • airtable-verification=6d9ec331d16b745375aa5645afdc6925
  • B4WHSL0HGFWUXSVNPSNEHWVP4OAS6K3V8ZX83YUQ
  • linkedin-site-verification=21bd39b2-dceb-4e35-a8ca-1fe31e638606
  • MS=ms17389787
  • amazonses:KI43fx06X3i1Z0RKVcBJx6HxT7jKw/78DnXhZebhyRI=
  • atlassian-domain-verification=MZVj30Gdxhiz9jqyn9Yd3LiDrUhYaka12HN17M3JTEUqZ+qO1n8aevB0EFMIxMjY
  • amazonses:uG5BsD7PWWFZLx6C0TbO5CurPVgIbEcCg2UvwmmhoFs=
  • QWA6XKq1-g9FT3E2L-vBpvHog5ndhYo3-WTJAQCuOWo
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