Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
marketingcollege.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 21:40:46 UTC · ↺ Refresh
MX Hostnames
- marketingcollege-com.p30.mxthunder.net
- marketingcollege-com.p10.mxthunder.com
- marketingcollege-com.p20.mxthunder.net
- marketingcollege-com.p40.mxthunder.net
MX Priorities
- marketingcollege-com.p20.mxthunder.net: 20
- marketingcollege-com.p30.mxthunder.net: 30
- marketingcollege-com.p40.mxthunder.net: 40
- marketingcollege-com.p10.mxthunder.com: 10
A / AAAA Records
- 172.67.183.10 (no PTR)
- 104.21.48.89 (no PTR)
- 2606:4700:3037::ac43:b70a (no PTR)
- 2606:4700:3033::6815:3059 (no PTR)
Mail Server IPs
- 208.53.48.247 ↩ bolt107b.mxthunder.net
- 108.60.195.198 ↩ bolt107a.mxthunder.net
SOA Record
Raw SOA
ara.ns.cloudflare.com dns.cloudflare.com 2399014230 10000 2400 604800 1800
Primary NS (mname)
ara.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2399014230
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
junade.ns.cloudflare.com
ara.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:82.69.11.58 ip4:217.36.3.213 ip4:178.79.133.62 ip4:139.162.231.63 include:spf.protection.outlook.com include:mailgun.org include:send.zcsend.eu -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]; fo=1; ri=86400;
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
4 records- google-site-verification=q8Hap3roIDOdovCt4NG2oXAvHjZMfmmVlygmD-mc2yw
- SPFv=spf1 ip4:82.69.11.58 ip4:217.36.3.213 ip4:178.79.133.62 ip4:139.162.231.63 include:spf.protection.outlook.com include:mailgun.org include:send.zcsend.eu -all
- vz13y40qm6nmldj4f8m2vd0517xq0xp4
- MS=ms12968626
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 marketingcollege.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits