xo.com

Valid Email Server
Domain Lookup › xo.com

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
xo.com
Yes
✓ Yes
Proofpoint
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-28 07:00:55 UTC · ↺ Refresh

MX Hostnames

  • mxa-0024a201.gslb.pphosted.com
  • mxb-0024a201.gslb.pphosted.com

MX Priorities

  • mxb-0024a201.gslb.pphosted.com: 0
  • mxa-0024a201.gslb.pphosted.com: 0

A / AAAA Records

  • 35.164.216.153 ↩ ec2-35-164-216-153.us-west-2.compute.amazonaws.com

Mail Server IPs

  • 148.163.153.92 ↩ mx0b-0024a201.pphosted.com
  • 148.163.149.93 ↩ mx0a-0024a201.pphosted.com

SOA Record

Raw SOA ns-twbg.verizonwireless.com hostmaster.xo.com 2013072091 10800 3600 604800 300
Primary NS (mname)
ns-twbg.verizonwireless.com
Admin Email (rname)
hostmaster@xo.com
Serial
2013072091
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
300s

Nameservers (NS)

ns-tmtr.verizonwireless.com
ns-twbg.verizonwireless.com
ns-scrm.verizonwireless.com

SPF Record

✓ Strict (-all)
v=spf1 ip4:205.158.160.37 ip4:205.158.160.39 ip4:205.158.160.44 ip4:205.158.160.45 ip4:207.88.96.56 ip4:207.88.96.57 ip4:207.155.252.25 ip4:207.155.248.233 include:spf-0024a201.pphosted.com include:xoint.net -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

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

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

6 records
  • amazonses:FR+snpgjR0bvj1KgWDDUDuQM0TdXqn4X3oZ645F0n7M=
  • google-site-verification=nA60hvX7sN1bxmbAE2aVwOpueFAf9CBZHRUjr83omZ0
  • qm0g7zkvj1t3z2l3dd3nlzfdm4pbg33w
  • mgb35kt7y711zvfn3g4lz51cr08mj5y2
  • SPFv=spf1 ip4:205.158.160.37 ip4:205.158.160.39 ip4:205.158.160.44 ip4:205.158.160.45 ip4:207.88.96.56 ip4:207.88.96.57 ip4:207.155.252.25 ip4:207.155.248.233 include:spf-0024a201.pphosted.com include:xoint.net -all
  • smartsheet-site-validation=V3VbRh97ABuGmpl_wREHAEWtsewGtJKC
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