Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sts-education.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-21 10:01:42 UTC · ↺ Refresh
MX Hostnames
- stseducation-de0i.mail.protection.outlook.com
MX Priorities
- stseducation-de0i.mail.protection.outlook.com: 0
A / AAAA Records
- 13.107.246.40 (no PTR)
- 13.107.213.40 (no PTR)
Mail Server IPs
- 52.101.68.21 ↩ mail-db4pr02cu00205.inbound.protection.outlook.com
- 52.101.73.16 ↩ mail-as2pr05cu00100.inbound.protection.outlook.com
- 52.101.73.28 ↩ mail-am7pr05cu00204.inbound.protection.outlook.com
- 52.101.68.15 ↩ mail-db6pr03cu00107.inbound.protection.outlook.com
- 2a01:111:f403:ca04:: ↩ mail-db3pr0202cu00100.inbound.protection.outlook.com
- 2a01:111:f403:ca04::6 ↩ mail-db4pr02cu00406.inbound.protection.outlook.com
- 2a01:111:f403:ca09::f ↩ mail-am7pr05cu00307.inbound.protection.outlook.com
- 2a01:111:f403:ca09::1 ↩ mail-as9pr07cu00301.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1-03.azure-dns.com azuredns-hostmaster.microsoft.com 1 3600 300 2419200 300
Primary NS (mname)
ns1-03.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
1
Refresh
3600s
Retry
300s
Expire
2419200s
Minimum TTL
300s
Nameservers (NS)
ns4-03.azure-dns.info
ns1-03.azure-dns.com
ns2-03.azure-dns.net
ns3-03.azure-dns.org
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com ip4:109.74.6.35 ip4:193.13.32.132 ip4:193.15.251.125 ip4:193.15.251.117 ip4:193.15.251.116 ip4:193.15.251.115 ip4:137.116.242.126 ip4:82.99.17.158 include:servers.mcsv.net include:_spf.staysecuregroup.com include:spf.emailsignatures365.com include:sendgrid.net -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 3 found
selector1._domainkey
selector2._domainkey
k1._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- MS=ms60464189
- enterproid-site-verification: 804a47beafbaddba8126525677dff1f4
- SPFv=spf1 include:spf.protection.outlook.com ip4:109.74.6.35 ip4:193.13.32.132 ip4:193.15.251.125 ip4:193.15.251.117 ip4:193.15.251.116 ip4:193.15.251.115 ip4:137.116.242.126 ip4:82.99.17.158 include:servers.mcsv.net include:_spf.staysecuregroup.com include:spf.emailsignatures365.com include:sendgrid.net -all
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