Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
biosphaere-potsdam.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-24 17:55:20 UTC · ↺ Refresh
MX Hostnames
- biosphaerepotsdam-de02e.mail.protection.outlook.com
MX Priorities
- biosphaerepotsdam-de02e.mail.protection.outlook.com: 0
A / AAAA Records
- 202.61.201.10 ↩ biosphaere.web.mageprofis.de
- 2a03:4000:5a:fce:c48c:6bff:fe73:d5b2 ↩ biosphaere.web.mageprofis.de
Mail Server IPs
- 52.101.170.0 ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
- 52.101.168.0 ↩ mail-beup281cu00100.inbound.protection.outlook.com
- 52.101.170.2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
- 52.101.170.1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
- 2a01:111:f403:ca2d::1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
- 2a01:111:f403:ca2d:: ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
- 2a01:111:f403:ca2d::2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
- 2a01:111:f403:ca27:: ↩ mail-beup281cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
b.ns14.net postmaster.loewenstark.com 2025120803 14400 1800 604800 3600
Primary NS (mname)
b.ns14.net
Admin Email (rname)
postmaster@loewenstark.com
Serial
2025120803
Refresh
14400s
Retry
1800s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
b.ns14.net
d.ns14.net
c.ns14.net
SPF Record
✓ Strict (-all)
v=spf1 ip4:202.61.201.10 include:spf.protection.outlook.com include:spf.mailjet.com include:spf.crsend.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;pct=100;rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 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 ip4:202.61.201.10 include:spf.protection.outlook.com include:spf.mailjet.com include:spf.crsend.com -all
- tTf31FKaP4maOXiifWy16UDEi6Xm5kWyyRq3wTogU5VMWSFZVaRuVtcKTTjhSruw9xHxogCWL9fYrWva4F9Yaw==
- jbqop36vu40078o11r0k4vb5m8
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for biosphaere-potsdam.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits