cortlandschools.org

Valid Email Server
Domain Lookup › cortlandschools.org

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
cortlandschools.org
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-04-04 22:08:54 UTC · ↺ Refresh

MX Hostnames

  • us-smtp-inbound-1.mimecast.com
  • alt1.aspmx.l.google.com
  • aspmx.l.google.com
  • alt2.aspmx.l.google.com
  • alt3.aspmx.l.google.com
  • alt4.aspmx.l.google.com
  • us-smtp-inbound-2.mimecast.com

MX Priorities

  • us-smtp-inbound-2.mimecast.com: 1
  • aspmx.l.google.com: 11
  • alt1.aspmx.l.google.com: 12
  • alt2.aspmx.l.google.com: 12
  • alt3.aspmx.l.google.com: 15
  • alt4.aspmx.l.google.com: 15
  • us-smtp-inbound-1.mimecast.com: 1

A / AAAA Records

  • 170.158.171.30

Mail Server IPs

  • 170.10.128.242 ↩ us-smtp-inbound-1.mimecast.com
  • 170.10.132.221 ↩ us-smtp-inbound-2.mimecast.com
  • 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
  • 170.10.128.221 ↩ us-smtp-inbound-2.mimecast.com
  • 170.10.128.141 ↩ us-smtp-inbound-1.mimecast.com
  • 170.10.132.141 ↩ us-smtp-inbound-2.mimecast.com
  • 142.251.179.26 ↩ pd-in-f26.1e100.net
  • 2607:f8b0:4004:c1f::1b ↩ pd-in-f27.1e100.net
  • 108.177.123.27 ↩ lcscld-in-f27.1e100.net
  • 2800:3f0:4003:c0f::1b (no PTR)
  • 172.253.116.27
  • 2a00:1450:400b:c02::1b
  • 192.178.223.26
  • 2a00:1450:4009:c0f::1a

SOA Record

Raw SOA arvind.ns.cloudflare.com dns.cloudflare.com 2397998917 10000 2400 604800 1800
Primary NS (mname)
arvind.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2397998917
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

arvind.ns.cloudflare.com
kelly.ns.cloudflare.com

SPF Record

✓ Soft Fail (~all)
v=spf1 include:us._netblocks.mimecast.com include:_spf.google.com include:customerspf.schoolmessenger.com ~all
📊 DNS lookups: 3/10
~ Soft fail (~all) — moderate 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

4 records
  • MS=ms67889808
  • MS=ms89664506.msv1.invalid
  • SPFv=spf1 include:us._netblocks.mimecast.com include:_spf.google.com include:customerspf.schoolmessenger.com ~all
  • 01/07/2025
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