Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
bytech-learning.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-31 13:58:41 UTC · ↺ Refresh
MX Hostnames
- bytechlearning-de01e.mail.protection.outlook.com
MX Priorities
- bytechlearning-de01e.mail.protection.outlook.com: 20
A / AAAA Records
- 81.169.145.80 ↩ w80.rzone.de
- 2a01:238:20a:202:1080:: ↩ w80.rzone.de
Mail Server IPs
- 52.101.68.5 ↩ mail-du2pr03cu00105.inbound.protection.outlook.com
- 52.101.73.30 ↩ mail-am7pr05cu00306.inbound.protection.outlook.com
- 52.101.68.36 ↩ mail-db5pr02cu00104.inbound.protection.outlook.com
- 52.101.68.16 ↩ mail-db4pr02cu00400.inbound.protection.outlook.com
- 2a01:111:f403:ca09:: ↩ mail-am3pr04cu00500.inbound.protection.outlook.com
- 2a01:111:f403:ca04::7 ↩ mail-db4pr02cu00307.inbound.protection.outlook.com
- 2a01:111:f403:ca04::2 ↩ mail-du2pr03cu00102.inbound.protection.outlook.com
- 2a01:111:f403:ca09::f ↩ mail-am7pr05cu00307.inbound.protection.outlook.com
SOA Record
Raw SOA
shades14.rzone.de hostmaster.strato-rz.de 2022091625 86400 7200 604800 300
Primary NS (mname)
shades14.rzone.de
Admin Email (rname)
hostmaster@strato-rz.de
Serial
2022091625
Refresh
86400s
Retry
7200s
Expire
604800s
Minimum TTL
300s
Nameservers (NS)
docks17.rzone.de
shades14.rzone.de
SPF Record
✓ Strict (-all)
v=spf1 ip4:217.91.100.206 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1;p=reject;
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 ip4:217.91.100.206 include:spf.protection.outlook.com -all
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