Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sdu-bo.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-01 17:29:14 UTC · ↺ Refresh
MX Hostnames
- sdubo-de0i.mail.protection.outlook.com
MX Priorities
- sdubo-de0i.mail.protection.outlook.com: 0
A / AAAA Records
- 154.56.104.21 ↩ ns3.edns.de
Mail Server IPs
- 52.101.73.30 ↩ mail-am7pr05cu00306.inbound.protection.outlook.com
- 52.101.73.11 ↩ mail-am1pr04cu00103.inbound.protection.outlook.com
- 52.101.68.10 ↩ mail-dbbpr03cu00102.inbound.protection.outlook.com
- 52.101.68.0 ↩ mail-db3pr0202cu00100.inbound.protection.outlook.com
- 2a01:111:f403:ca04::c ↩ mail-db9pr02cu00204.inbound.protection.outlook.com
- 2a01:111:f403:ca09::b ↩ mail-am7pr05cu00103.inbound.protection.outlook.com
- 2a01:111:f403:ca04::a ↩ mail-du0pr03cu00102.inbound.protection.outlook.com
- 2a01:111:f403:ca09::7 ↩ mail-am9pr04cu00107.inbound.protection.outlook.com
SOA Record
Raw SOA
ns3.edns.de dns.sdu-bo.de 2020072453 3600 3600 604800 3600
Primary NS (mname)
ns3.edns.de
Admin Email (rname)
dns@sdu-bo.de
Serial
2020072453
Refresh
3600s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns3.edns.de
ns4.edns.de
SPF Record
✓ Strict (-all)
v=spf1 ip4:162.120.188.193 ip4:212.23.132.122 ip4:80.147.8.241 include:spf.protection.outlook.com include:spf-de.emailsignatures365.com mx -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100;sp=none; adkim=r; aspf=r
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
↳ Subdomain policy: none
DKIM Selectors
✓ 1 found
dkim._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: dkim
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
4 records- SPFv=spf1 ip4:162.120.188.193 ip4:212.23.132.122 ip4:80.147.8.241 include:spf.protection.outlook.com include:spf-de.emailsignatures365.com mx -all
- redirect:https://www.schrauben-und-draht-union.de
- swisssign-check=JdBwoPpx51J9RjRzaijJg0VQGkI
- swisssign-check=gWFbVIw4417kVlxSQLubkS4SjeM
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