Domain Overview
DNS: ✓ 3d ago
Checker: ✓ 3d ago
redstarchem.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-05-18 12:19:27 UTC · ↺ Refresh
MX Hostnames
- mxv.zmail300.cn
- mxf.zmail300.cn
- mxw.zmail300.cn
MX Priorities
- mxf.zmail300.cn: 5
- mxv.zmail300.cn: 10
- mxw.zmail300.cn: 50
A / AAAA Records
- 123.59.154.172 (no PTR)
Mail Server IPs
- 101.237.133.34 ↩ outhb2.global-mail.cn
- 152.32.192.120 (no PTR)
SOA Record
Raw SOA
ns11.xincache.com ns12.xincache.com 1772090935 3600 180 1209600 180
Primary NS (mname)
ns11.xincache.com
Admin Email (rname)
ns12@xincache.com
Serial
1772090935
Refresh
3600s
Retry
180s
Expire
1209600s
Minimum TTL
180s
Nameservers (NS)
ce2.xincache.com
ce1.xincache.com
SPF Record
✓ Strict (-all)
v=spf1 include:spfv.zmail300.cn -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict 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- _globalsign-domain-verification=SNCdhmZTW6uVDNRWLz29bgAhgaS6v_282n1WFtAqfr
- SPFv=spf1 include:spfv.zmail300.cn -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 redstarchem.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits