SSL-Tools

SSL check results of pdvorak.cz

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Discover if the mail servers for pdvorak.cz can be reached through a secure connection.

To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.

Summary

JSON Refresh

Report created Mon, 13 Apr 2026 00:30:41 +0000

The mailservers of pdvorak.cz can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @pdvorak.cz addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.pdvorak.cz
2a03:3b40:fe:21a::1
 10
supported
mail.pdvorak.cz
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
mail.pdvorak.cz
37.205.13.252
 10
supported
mail.pdvorak.cz
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
dfd111548942b2da.mx1.emailprofi.seznam.cz
2a02:598:2::1056
Results incomplete
20
supported
not checked
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
dfd111548942b2da.mx1.emailprofi.seznam.cz
77.75.77.56
Results incomplete
20
supported
not checked
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s

Outgoing Mails

We have not received any emails from a @pdvorak.cz address so far. Test mail delivery

Certificates

First seen at:

CN=mail.pdvorak.cz

Certificate chain
  • mail.pdvorak.cz
    • remaining
    • 256 bit
    • ecdsa-with-SHA384
      • E8
        • remaining
        • 384 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • mail.pdvorak.cz
Alternative Names
  • mail.pdvorak.cz
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • E8
validity period
Not valid before
2026-03-30
Not valid after
2026-06-28
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
Fingerprints
SHA256
67:B6:35:F0:07:45:3C:76:6A:F0:AB:CA:7D:35:E5:C5:02:16:4A:ED:04:10:4F:D3:01:88:44:B9:98:B0:C2:48
SHA1
1D:F4:2E:AF:4C:78:2D:E7:38:03:D4:DC:50:89:37:4D:19:9C:88:0B
X509v3 extensions
subjectKeyIdentifier
  • B3:5D:66:80:69:B2:B0:2C:B1:76:A7:74:E9:F6:60:46:C3:0D:85:09
authorityKeyIdentifier
  • keyid:8F:0D:13:A2:F6:2E:7E:D1:50:6C:33:18:38:5D:59:8E:23:72:91:CA
authorityInfoAccess
  • CA Issuers - URI:http://e8.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://e8.c.lencr.org/44.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 71:7E:95:F3:C2:38:8A:6D:B1:E3:84:49:3D:31:E1:5A:
  • A9:62:08:76:2D:42:00:E0:05:0C:D0:67:B5:A6:61:E2
  • Timestamp : Mar 30 15:49:40.807 2026 GMT
  • Extensions: 00:00:05:00:0C:FD:EB:91
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:E0:4A:82:53:5A:E7:65:8B:E1:0F:F6:
  • F1:8E:B7:25:F4:77:76:80:34:67:C2:D8:BA:C2:87:C8:
  • 07:2F:1E:11:5B:02:21:00:E1:06:FE:07:4A:4E:24:FC:
  • 51:BF:0A:77:8B:92:79:0C:05:E2:AF:0E:22:3C:FA:24:
  • 31:98:0D:D3:64:A4:10:DF
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0E:57:94:BC:F3:AE:A9:3E:33:1B:2C:99:07:B3:F7:90:
  • DF:9B:C2:3D:71:32:25:DD:21:A9:25:AC:61:C5:4E:21
  • Timestamp : Mar 30 15:49:40.711 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:19:B0:31:06:AD:7D:DE:DC:3A:51:D6:7D:
  • 24:1D:C7:73:53:4E:CF:7E:EA:DE:6B:63:7D:A8:52:08:
  • 95:96:FA:A3:02:21:00:EB:02:6B:33:4F:AB:B3:B0:8F:
  • BB:3E:86:4B:50:15:B7:2E:E1:69:AC:0F:98:BF:DC:77:
  • 6F:83:74:2E:DB:D5:24