SSL-Tools

SSL check results of chytrysoftware.cz

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Discover if the mail servers for chytrysoftware.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 Wed, 05 Aug 2026 00:32:04 +0000

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

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

/mailservers/chytrysoftware.cz

Servers

Incoming Mails

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

Hostname / IP address Priority STARTTLS Certificates Protocol
mailgw.opavanet.cz
213.155.255.67
 0
supported
.
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
20 s
ms2.opanet.cz
213.155.255.40
Results incomplete
50 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
11 s

Outgoing Mails

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

Certificates

First seen at:

CN=.

Certificate chain
  • . (Certificate is self-signed.)
    • remaining
    • 4096 bit
    • sha384WithRSAEncryption
    • Hostname Mismatch
    • Expired
    • Unknown Authority
Subject
Common Name (CN)
  • .
Issuer

Certificate is self-signed.

validity period
Not valid before
2017-03-03
Not valid after
2019-11-28
Fingerprints
SHA256
07:77:01:30:AF:35:F1:BA:C3:CB:A2:06:1A:D5:F6:62:CF:F6:72:B6:E9:F1:01:8A:5D:FA:0F:E1:64:A3:CE:EF
SHA1
1C:B4:03:3B:DA:14:D9:9B:4A:C4:00:07:1F:7A:49:DE:CF:20:31:35
X509v3 extensions
subjectKeyIdentifier
  • 6D:EB:95:F9:FD:B5:AB:63:3C:C6:69:DB:1D:5B:E1:1A:6E:71:9D:BB
authorityKeyIdentifier
  • keyid:6D:EB:95:F9:FD:B5:AB:63:3C:C6:69:DB:1D:5B:E1:1A:6E:71:9D:BB