SSL-Tools

SSL check results of linuxcoaching.org

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Discover if the mail servers for linuxcoaching.org 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

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Report created Fri, 14 Aug 2026 00:30:34 +0000

We can not guarantee a secure connection to the mailservers of linuxcoaching.org!

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

/mailservers/linuxcoaching.org

Servers

Incoming Mails

These servers are responsible for incoming mails to @linuxcoaching.org addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
smtp.linuxcoaching.org
77.235.58.218
 10
supported
linuxcoaching
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s
lco.linuxcoaching.org
213.41.157.207
Results incomplete
20 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 @linuxcoaching.org address so far. Test mail delivery

Certificates

First seen at:

emailAddress=root@linuxcoaching,CN=linuxcoaching,OU=SomeOrganizationalUnit,O=SomeOrganization,L=SomeCity,ST=SomeState,C=--

Certificate chain
  • linuxcoaching (Certificate is self-signed.)
    • remaining
    • 4096 bit
    • sha256WithRSAEncryption
    • Hostname Mismatch
    • Unknown Authority
Subject
Country (C)
  • --
State (ST)
  • SomeState
Locality (L)
  • SomeCity
Organization (O)
  • SomeOrganization
Organizational Unit (OU)
  • SomeOrganizationalUnit
Common Name (CN)
  • linuxcoaching
Email
  • root@linuxcoaching
Issuer

Certificate is self-signed.

validity period
Not valid before
2026-07-21
Not valid after
2027-07-21
Fingerprints
SHA256
C4:19:78:C6:E2:C9:C5:0B:F7:8D:A3:26:AC:97:33:68:C0:BA:6F:FF:ED:5A:9C:D9:B5:EC:78:8D:AC:99:96:E0
SHA1
0F:B0:C2:F4:CC:9E:88:F3:11:F0:B4:65:60:73:12:3C:7E:CF:C4:F6
X509v3 extensions
subjectKeyIdentifier
  • 5C:1F:70:F8:A9:DF:9B:15:82:4D:49:79:7C:EB:CA:1C:B2:48:BF:0C
authorityKeyIdentifier
  • keyid:5C:1F:70:F8:A9:DF:9B:15:82:4D:49:79:7C:EB:CA:1C:B2:48:BF:0C