Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
isu-inc.net
Yes
✓ Yes
Proofpoint
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 03:38:19 UTC · ↺ Refresh
MX Hostnames
- mx0a-000e6b01.pphosted.com
- mx0b-000e6b01.pphosted.com
MX Priorities
- mx0b-000e6b01.pphosted.com: 20
- mx0a-000e6b01.pphosted.com: 10
A / AAAA Records
- 23.236.62.147 ↩ 147.62.236.23.bc.googleusercontent.com
Mail Server IPs
- 67.231.152.59 ↩ mx0b-000e6b01.pphosted.com
- 67.231.144.82 ↩ mx0a-000e6b01.pphosted.com
SOA Record
Raw SOA
ns29.worldnic.com namehost.worldnic.com 125110714 10800 3600 604800 3600
Primary NS (mname)
ns29.worldnic.com
Admin Email (rname)
namehost@worldnic.com
Serial
125110714
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns29.worldnic.com
ns30.worldnic.com
SPF Record
✓ Soft Fail (~all)
v=spf1 a:cluster5a.us.messagelabs.com a:cluster5.us.messagelabs.com ip4:157.174.228.62 ip4:157.174.228.60 ip4:67.30.143.254 ip4:96.71.108.2 include:spf.messagelabs.com include:spf.protection.outlook.com ~all
📊 DNS lookups: 4/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; fo=1; rua=mailto:[email protected]; ruf=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 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 a:cluster5a.us.messagelabs.com a:cluster5.us.messagelabs.com ip4:157.174.228.62 ip4:157.174.228.60 ip4:67.30.143.254 ip4:96.71.108.2 include:spf.messagelabs.com include:spf.protection.outlook.com ~all
- MS=ms79807593
- knowbe4-site-verification=4e56e7ea4d79808aa10e09ad5aa90f97
Full email verification for isu-inc.net
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
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