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78
Total
95
DNS
45
Email
65
Security
85
Network
100
Availability
Domainpostfix.org
IPv41
IPv61
MX records1
StatusActive
Domain technical report

The Postfix Home Page

postfix.org

Generated: 2026-08-09T13:20:29-05:00 · Cached result

JSONCSVPDFVisit site
IPv41
IPv61
MX1
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

1 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

2 NS record(s); 2 or more required.

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

✓
DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

!
CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

1 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

!
DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

35 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

!
HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: karnak.horus-it.de

i
IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓
IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓
HTTP response40 / 40 pts · Availability

HTTP/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
95.216.145.1

AAAA

1 record(s)
2a01:4f9:c010:8fb::bee

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 list.sys4.de.

TXT

1 record(s)
"v=spf1 include:_spf.list.sys4.de ~all"

NS

2 record(s)
ns2.desec.org.
ns1.desec.io.

SOA

1 record(s)
get.desec.io. get.desec.io. 2026064055 86400 3600 2419200 3600

CAA

0 record(s)
—

Not configured

DS

2 record(s)
160 13 2 B7685295BB804541B05659745807F93233BAC3FD0622198EC58A6809 68A58CA5
60454 13 2 6C547AF789D87928823435F6588BA3F5200800C4BBBDCDC44F17D642 2BD09E88

DNSKEY

1 record(s)
257 3 13 jsInJDgy9mq/k9EO3EZsq5OjenVgHiam9sW06eCsRnlVbTwtkLQ+aFmX B+wqxGe7HFAjEx6ayr2cedPXRiWi2Q==

RRSIG

3 record(s)
NS 13 2 3600 20260820000000 20260730000000 160 postfix.org. hoTQhk3t10lIsMXI4jt1CP1fYBO+klHunMDyulY8bSI8zKt+yHcCWnZK gHJOfj+4qT/U5sKdku5aOAgt4WgFtg==
TXT 13 2 3600 20260820000000 20260730000000 160 postfix.org. eFOm76Z8nRC+jNhfSVmZbJY/PgMJOO4FmktcxGxFzoEsJiTkE1XDDCpe SeWlXfIR2TPyz/wqjGVg+C4KF3GdMw==
DS 8 2 3600 20260830152406 20260809142406 44925 org. iwP8TuTD2NwqcXuQC4vjcVHfeOyK60n6NLzcdbqvBGIO6MfFp87Gv7n0 jrTnBD9NT2skMCgB0JtuQu8feFHt3RoWDX3qaHHxg2dWZXHeJQycn66w Z4CCmhu0/DvpgJgAVLBQZFurYSUBwvvpYbK+6aXi0WxDmxa0b2hcezsO A3g=

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 include:_spf.list.sys4.de ~all

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
The Postfix Home Page
Description
Final URL
https://www.postfix.org/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.postfix.org/
Version
3
Server
nginx
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
postfix.org
Valid from
2026-06-15T22:46:31-05:00
Valid until
2026-09-13T22:46:30-05:00
Days remaining
35
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

0 active
—
HSTSNot detected
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
—
X-Frame-OptionsNot detected
—
Referrer PolicyNot detected
—
Permissions PolicyNot detected
—
Cross-Origin-Opener-PolicyNot detected
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
95.216.145.1
104,35 ms
Cloudflare
1.1.1.1
95.216.145.1
43,92 ms
Quad9
9.9.9.9
95.216.145.1
69,57 ms
OpenDNS
208.67.222.222
95.216.145.1
84,31 ms
AdGuard
94.140.14.14
95.216.145.1
435,27 ms

IP, geolocation and ASNAssociated network information

95.216.145.1

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

list.sys4.de

Port 25: Closed/unreachable - 140 ms - 
Port 465: Closed/unreachable - 261.6 ms - 
Port 587: Closed/unreachable - 258.6 ms -

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