Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
jeffersonhealth.org
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-26 11:21:17 UTC · ↺ Refresh
MX Hostnames
- mail.jefferson.edu
MX Priorities
- mail.jefferson.edu: 5
A / AAAA Records
- 35.173.209.146
Mail Server IPs
- 147.140.23.69 ↩ smtpin07pb.jefferson.edu
- 147.140.23.68 ↩ smtpin07pa.jefferson.edu
- 147.140.23.67 ↩ smtpin06pb.jefferson.edu
- 147.140.23.66 ↩ res4.jefferson.edu
- 147.140.23.46 ↩ smtp.jefferson.edu
- 147.140.23.43 ↩ smtp.jefferson.edu
- 147.140.23.77 ↩ smtpin04pa.jefferson.edu
- 147.140.23.42 ↩ smtp.jefferson.edu
- 147.140.23.40 ↩ smtp.jefferson.edu
- 147.140.23.74 ↩ smtp.jefferson.edu
- 147.140.23.52
- 147.140.23.51
- 147.140.23.35
- 147.140.23.64
SOA Record
Raw SOA
ns4.jefferson.edu hostmaster.tju.edu 86984 21600 3600 604800 600
Primary NS (mname)
ns4.jefferson.edu
Admin Email (rname)
hostmaster@tju.edu
Serial
86984
Refresh
21600s
Retry
3600s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns4.jefferson.edu
ns3.tju.edu
SPF Record
✓ Strict (-all)
v=spf1 exists:%{i}._i.%{d}._d.espf.agari.com include:%{d}.30.spf-protect.agari.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; fo=1; pct=100; ri=3600; rua=mailto:[email protected]; ruf=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 392 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
3 records- SPFv=spf1 exists:%{i}._i.%{d}._d.espf.agari.com include:%{d}.30.spf-protect.agari.com -all
- google-site-verification=ANrfALJyfW8vtBdJvP2o6Z3DHVRWDE0vgFyMVnv40v4
- CBA7-50B5-3401-7F52-BB66-075F-0DB7-6105
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 jeffersonhealth.org
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits