contactcostco.ca

Valid Email Server
Domain Lookup › contactcostco.ca

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
contactcostco.ca
Yes
✓ Yes
Proofpoint
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-22 04:18:31 UTC · ↺ Refresh

MX Hostnames

  • mx0b-001f9d01.pphosted.com
  • mx0a-001f9d01.pphosted.com

MX Priorities

  • mx0a-001f9d01.pphosted.com: 10
  • mx0b-001f9d01.pphosted.com: 10

A / AAAA Records

  • 64.211.226.25 ↩ sc8mail17.egain.net

Mail Server IPs

  • 148.163.156.53 ↩ mx0a-001f9d01.pphosted.com
  • 148.163.158.49 ↩ mx0b-001f9d01.pphosted.com

SOA Record

Raw SOA appnsa01223p02.costco.com rm-hostmaster.ems.att.com 91 10800 3600 2332800 900
Primary NS (mname)
appnsa01223p02.costco.com
Admin Email (rname)
rm-hostmaster@ems.att.com
Serial
91
Refresh
10800s
Retry
3600s
Expire
2332800s
Minimum TTL
900s

Nameservers (NS)

a6-64.akam.net
a1-116.akam.net
dmtu.mt.ns.els-gms.att.net
dbru.br.ns.els-gms.att.net
a5-64.akam.net
a9-66.akam.net
a14-67.akam.net
a28-66.akam.net

SPF Record

✓ Strict (-all)
v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

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

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

1 record
  • SPFv=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com -all
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