Domain Overview
DNS: ✓ 1d ago
Checker: ✓ 1d ago
smbu.edu.cn
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-07-27 19:06:06 UTC · ↺ Refresh
MX Hostnames
- mxbiz1.qq.com
- mxbiz2.qq.com
MX Priorities
- mxbiz2.qq.com: 10
- mxbiz1.qq.com: 5
A / AAAA Records
- 121.15.0.121 (no PTR)
Mail Server IPs
- 43.154.252.16 (no PTR)
- 43.154.252.202 (no PTR)
- 103.86.78.2 (no PTR)
- 103.86.78.3 (no PTR)
SOA Record
Raw SOA
moonlight.sz.edu.cn suzz.sz.edu.cn 2026063000 3600 1800 604800 3600
Primary NS (mname)
moonlight.sz.edu.cn
Admin Email (rname)
suzz@sz.edu.cn
Serial
2026063000
Refresh
3600s
Retry
1800s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
sunshine.sz.edu.cn
moonlight.sz.edu.cn
SPF Record
✓ Soft Fail (~all)
v=spf1 include:spf.mail.qq.com ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo 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
2 records- SPFv=spf1 include:spf.mail.qq.com ~all
- MS=80D5C4F5898F52D1AC174DB521D5361341261C5B
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 · Customize →
See demo & docs
Deep verification
Full email verification for smbu.edu.cn
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits