SSL-Tools

SSL check results of autoskolam2.cz

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Discover if the mail servers for autoskolam2.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 Fri, 01 May 2026 00:30:44 +0000

We can not guarantee a secure connection to the mailservers of autoskolam2.cz!

Please contact the operator of autoskolam2.cz and ask him or her to solve this problem. This result stays accessible under the following address:

/mailservers/autoskolam2.cz

Servers

Incoming Mails

These servers are responsible for incoming mails to @autoskolam2.cz addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
smtp.adsystem.info
2001:15e8:110:7d00::397
Results incomplete
10
unsupported
not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
smtp.adsystem.info
85.255.6.205
Results incomplete
10
unsupported
not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
smtp2.adsystem.info
2001:15e8:110:75e2::1
 20
supported
merkur.adsystem.info
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s
smtp2.adsystem.info
194.182.86.226
 20
supported
merkur.adsystem.info
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s

Outgoing Mails

We have not received any emails from a @autoskolam2.cz address so far. Test mail delivery

Certificates

First seen at:

CN=merkur.adsystem.info

Certificate chain
  • merkur.adsystem.info
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
    • Hostname Mismatch
      • R12
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • merkur.adsystem.info
Alternative Names
  • merkur.adsystem.info
  • neptun.adsystem.info
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R12
validity period
Not valid before
2026-03-25
Not valid after
2026-06-23
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
Fingerprints
SHA256
7F:8F:7C:5C:94:BC:8D:B9:E7:DC:37:31:40:B8:42:36:97:F4:8E:DE:01:1E:CD:04:C1:6D:6A:E9:91:FE:BC:19
SHA1
1B:60:AD:3B:DC:55:E3:78:32:C2:00:C5:AC:33:6A:40:EE:C6:2F:9F
X509v3 extensions
subjectKeyIdentifier
  • 2D:27:61:0D:9F:18:4A:D8:EC:A3:61:3B:3B:42:8B:36:61:3A:56:FD
authorityKeyIdentifier
  • keyid:00:B5:29:F2:2D:8E:6F:31:E8:9B:4C:AD:78:3E:FA:DC:E9:0C:D1:D2
authorityInfoAccess
  • CA Issuers - URI:http://r12.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r12.c.lencr.org/62.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 25 22:28:12.807 2026 GMT
  • Extensions: 00:00:05:00:0C:91:F4:E1
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:25:0A:79:D3:B0:1F:84:95:DA:93:15:1C:
  • 97:CB:DE:CF:9C:61:9C:CD:CA:D5:A2:5C:0E:50:54:EE:
  • CD:77:2A:F1:02:20:44:47:BA:AF:B6:21:BE:EA:6B:66:
  • CA:CE:49:72:94:46:63:2B:C8:80:37:1F:05:CE:04:E1:
  • 8C:72:77:F2:C0:D6
  • 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 25 22:28:12.749 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:22:AF:15:4E:A2:27:C2:0F:4A:C9:BD:83:
  • 52:21:D8:DE:2E:B9:D3:DC:FB:22:C7:6B:F6:AD:7C:AC:
  • 81:86:94:AA:02:20:19:C7:1A:23:26:F7:AC:F1:FD:9E:
  • 36:04:FD:A9:29:02:DE:B7:01:43:21:7F:34:48:46:11:
  • 37:D5:AF:45:55:66