markstein.co

Valid Email Server
Domain Lookup › markstein.co

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
markstein.co
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-21 14:17:06 UTC · ↺ Refresh

MX Hostnames

  • markstein-co.mail.protection.outlook.com

MX Priorities

  • markstein-co.mail.protection.outlook.com: 0

A / AAAA Records

  • 141.193.213.11 (no PTR)
  • 141.193.213.10 (no PTR)

Mail Server IPs

  • 52.101.41.54 ↩ mail-sj2pr05cu00506.inbound.protection.outlook.com
  • 52.101.10.16 ↩ mail-bn6pr21cu00500.inbound.protection.outlook.com
  • 52.101.11.10 ↩ mail-sa9pr03cu00202.inbound.protection.outlook.com
  • 52.101.9.14 ↩ mail-bl0pr03cu00206.inbound.protection.outlook.com
  • 2a01:111:f403:c927:: ↩ mail-bn6pr21cu00500.inbound.protection.outlook.com
  • 2a01:111:f403:c902::3 ↩ mail-sj0pr03cu01703.inbound.protection.outlook.com
  • 2a01:111:f403:c902::1 ↩ mail-sj2pr05cu00401.inbound.protection.outlook.com
  • 2a01:111:f403:c902::4 ↩ mail-sj0pr03cu01504.inbound.protection.outlook.com

SOA Record

Raw SOA chan.ns.cloudflare.com dns.cloudflare.com 2398454618 10000 2400 604800 1800
Primary NS (mname)
chan.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2398454618
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

lee.ns.cloudflare.com
chan.ns.cloudflare.com

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:spf-us.emailsignatures365.com include:one.zoho.com include:zcsend.net -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

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

DKIM Selectors

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

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

All TXT Records

10 records
  • google-site-verification=KAPHkVZ4W5HLAPVdrvPY11Y6R7zfZ9lbm8s8cpglUYE
  • google-site-verification=bxlRpVjALy7axat35VD-gkY_vM_HYtlCqV7rHvB6-ag
  • google-site-verification=dXpNvGwTYCN1ChhPCZq9Hh96SJgTsRY2Z_yk_xm87js
  • google-site-verification=lNwbIVhMqwot3OIHf_uhIGRSki4SWaUXBQnk-7rFUyA
  • google-site-verification=x1x_sSh2WZcOfLNqlNcpcrXa5HkDDiu9aeqR1m0K1xY
  • linkedin-site-verification=cc7a1b0a-e37b-44b8-9b36-758acc75f1a8
  • SPFv=spf1 include:spf.protection.outlook.com include:spf-us.emailsignatures365.com include:one.zoho.com include:zcsend.net -all
  • v=verifydomain MS=1979836
  • zoho-verification=zb08509969.zmverify.zoho.com
  • MS=ms78677997
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