guidestar.org

Valid Email Server
Domain Lookup › guidestar.org

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
guidestar.org
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-18 09:17:45 UTC · ↺ Refresh

MX Hostnames

  • guidestar-org.mail.protection.outlook.com

MX Priorities

  • guidestar-org.mail.protection.outlook.com: 10

A / AAAA Records

  • 44.192.207.12 ↩ ec2-44-192-207-12.compute-1.amazonaws.com
  • 98.94.242.138 ↩ ec2-98-94-242-138.compute-1.amazonaws.com

Mail Server IPs

  • 52.101.50.7 ↩ mail-co1pr21cu00207.inbound.protection.outlook.com
  • 52.101.194.13 ↩ mail-ch0pr04cu00605.inbound.protection.outlook.com
  • 52.101.41.24 ↩ mail-sj0pr03cu01600.inbound.protection.outlook.com
  • 52.101.41.28 ↩ mail-sj0pr03cu01504.inbound.protection.outlook.com
  • 2a01:111:f403:f90f:: ↩ mail-sa9pr04cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:c92c::3 ↩ mail-dm5pr04cu00103.inbound.protection.outlook.com
  • 2a01:111:f403:c927:: ↩ mail-bn6pr21cu00500.inbound.protection.outlook.com
  • 2a01:111:f403:c902::4 ↩ mail-sj0pr03cu01504.inbound.protection.outlook.com

SOA Record

Raw SOA ns-372.awsdns-46.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-372.awsdns-46.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

ns-1008.awsdns-62.net
ns-1484.awsdns-57.org
ns-1803.awsdns-33.co.uk
ns-372.awsdns-46.com

SPF Record

✓ Soft Fail (~all)
v=spf1 include:spf.protection.outlook.com a mx include:spf.braintreegateway.com ip4:18.233.173.82 a:emailer.guidestar.org a:md02.com a:guidestarusa.onmicrosoft.com a:smtpprod02.guidestar.org include:amazonses.com ~all
📊 DNS lookups: 9/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ Missing

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

DKIM Selectors

✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: selector1

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

All TXT Records

5 records
  • globalsign-domain-verification=4C91062FCFE1413B492838C455A8F4CA
  • google-site-verification=q-4eQCrROiMeSk2dPlcjubnpmqCTVStzkXE8PFm0OOg
  • ms=ms89461254
  • SPFv=spf1 include:spf.protection.outlook.com a mx include:spf.braintreegateway.com ip4:18.233.173.82 a:emailer.guidestar.org a:md02.com a:guidestarusa.onmicrosoft.com a:smtpprod02.guidestar.org include:amazonses.com ~all
  • AGQI2qR0IczgUeJbIJZMFS1bxxTbtcqm+R6w2B53Q+DSE7zYshzrObL71xHls4GpZJgKQ8EDc6Z292Zxpyv7xQ==
Free · No signup required
Add email validation to your forms

Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.

<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for guidestar.org

SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.

No credit card required
Get 1,000 Free Credits