Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
cs.columbia.edu
Yes
✓ Yes
Proofpoint
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-27 03:14:03 UTC · ↺ Refresh
MX Hostnames
- mxa-00364e01.gslb.pphosted.com
- mxb-00364e01.gslb.pphosted.com
MX Priorities
- mxa-00364e01.gslb.pphosted.com: 10
- mxb-00364e01.gslb.pphosted.com: 10
A / AAAA Records
- 128.59.11.206 ↩ webcluster.cs.columbia.edu
Mail Server IPs
- 148.163.135.74 ↩ mx0a-00364e01.pphosted.com
SOA Record
Raw SOA
apollo.cs.columbia.edu hostmaster.cs.columbia.edu 301159131 18000 9000 604800 3600
Primary NS (mname)
apollo.cs.columbia.edu
Admin Email (rname)
hostmaster@cs.columbia.edu
Serial
301159131
Refresh
18000s
Retry
9000s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ext-ns2.columbia.edu
ext-ns1.columbia.edu
apollo.cs.columbia.edu
diana.cs.columbia.edu
sundog.ee.columbia.edu
SPF Record
✓ Soft Fail (~all)
v=spf1 ip4:128.59.8.0/22 ip4:128.59.16.0/21 include:columbia.edu ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo 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
2 records- google-site-verification=Xw3xpx86aasDi2lMHTTuU1sZJmZsz0geENkjviCCehY
- SPFv=spf1 ip4:128.59.8.0/22 ip4:128.59.16.0/21 include:columbia.edu ~all
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