sdu.edu.cn

Valid Email Server
Domain Lookup › sdu.edu.cn

Domain Overview

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

Checked via [email protected] · 2026-03-28 09:29:57 UTC · ↺ Refresh

MX Hostnames

  • mx-sdu-edu-cn.icoremail.net
  • sdu.edu.cn

MX Priorities

  • sdu.edu.cn: 10
  • mx-sdu-edu-cn.icoremail.net: 5

A / AAAA Records

  • 202.194.15.6 ↩ sdu.edu.cn
  • 211.86.56.247 ↩ sdu.edu.cn
  • 202.194.14.6 ↩ sdu.edu.cn

Mail Server IPs

  • 202.194.15.6 ↩ sdu.edu.cn
  • 211.86.56.247 ↩ sdu.edu.cn
  • 202.194.14.6 ↩ sdu.edu.cn
  • 152.32.234.63 ↩ ucloud-cmmxproxy.icoremail.net
  • 165.154.206.37 ↩ ucloud-cmmxproxy.icoremail.net

SOA Record

Raw SOA ns.sdu.edu.cn mail.sdu.edu.cn 1258 28800 3600 604800 1800
Primary NS (mname)
ns.sdu.edu.cn
Admin Email (rname)
mail@sdu.edu.cn
Serial
1258
Refresh
28800s
Retry
3600s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

sdunetnms.sdu.edu.cn
sdunetsv2.sdu.edu.cn
sdunetsv3.sdu.edu.cn

SPF Record

✓ Strict (-all)
v=spf1 ip4:202.194.15.6 ip4:202.194.14.6 ip4:211.86.56.247 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
  • SPFv=spf1 ip4:202.194.15.6 ip4:202.194.14.6 ip4:211.86.56.247 include:spf.icoremail.net -all
  • _yxei1p4rs4wrzu1xkjc21adqzpy1kve
  • adobe-idp-site-verification=cef8bf80d248a94fa8b062412bf40df7a25445b49d5aac2d1eb7a642700bc455
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