ustb.edu.cn

Valid Email Server
Domain Lookup › ustb.edu.cn

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
ustb.edu.cn
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-23 01:25:06 UTC · ↺ Refresh

MX Hostnames

  • smtp.ustb.edu.cn

MX Priorities

  • smtp.ustb.edu.cn: 20

A / AAAA Records

  • 202.204.49.199 (no PTR)

Mail Server IPs

  • 202.204.60.20 ↩ smtp.ustb.edu.cn

SOA Record

Raw SOA dns.ustb.edu.cn root.dns.ustb.edu.cn 2478 10800 3600 604800 86400
Primary NS (mname)
dns.ustb.edu.cn
Admin Email (rname)
root@dns.ustb.edu.cn
Serial
2478
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
86400s

Nameservers (NS)

dns.ustb.edu.cn
dns4.ustb.edu.cn
dns2.ustb.edu.cn

SPF Record

✓ Strict (-all)
v=spf1 ip4:202.204.60.0/26 include:spf.icoremail.net -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict 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

3 records
  • MS=ms82541787
  • adobe-idp-site-verification=bfaa26948dc12faed0ae062104d9f807e3c9d79b2db1470230139e1a246e13e7
  • SPFv=spf1 ip4:202.204.60.0/26 include:spf.icoremail.net -all
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 ustb.edu.cn

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

No credit card required
Get 1,000 Free Credits