SSL-Tools

SSL check results of kalmar.net

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Discover if the mail servers for kalmar.net 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 Thu, 10 Jul 2025 10:14:09 +0000

We can not guarantee a secure connection to the mailservers of kalmar.net!

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

/mailservers/kalmar.net

Servers

Incoming Mails

These servers are responsible for incoming mails to @kalmar.net addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.mellstrand.se
2001:9b1:9bce::10
Results incomplete
1
unsupported
not checked
DANE
errors
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
mail.mellstrand.se
85.24.228.174
 1
supported
mail.mellstrand.net
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s

Outgoing Mails

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

Certificates

First seen at:

CN=mail.mellstrand.net

Certificate chain
  • mail.mellstrand.net
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R11
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • mail.mellstrand.net
Alternative Names
  • mail.mellstrand.net
  • mail.mellstrand.se
  • mail4.mellstrand.net
  • mail4.mellstrand.se
  • mail6.mellstrand.net
  • mail6.mellstrand.se
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R11
validity period
Not valid before
2025-07-09
Not valid after
2025-10-07
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
FF:B8:7E:D2:21:57:F8:D6:4B:1F:F5:28:74:EF:B1:7C:0A:52:31:28:72:31:EE:0B:80:75:A0:3C:CD:70:98:05
SHA1
13:D2:F2:E1:C8:C0:0D:04:BA:8B:E8:88:CB:56:28:C8:C9:5B:77:F7
X509v3 extensions
subjectKeyIdentifier
  • 81:FA:4B:04:11:E7:34:AE:A6:74:D7:9C:5E:C0:75:D4:0D:8C:1D:6D
authorityKeyIdentifier
  • keyid:C5:CF:46:A4:EA:F4:C3:C0:7A:6C:95:C4:2D:B0:5E:92:2F:26:E3:B9
authorityInfoAccess
  • CA Issuers - URI:http://r11.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r11.c.lencr.org/51.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 7D:59:1E:12:E1:78:2A:7B:1C:61:67:7C:5E:FD:F8:D0:
  • 87:5C:14:A0:4E:95:9E:B9:03:2F:D9:0E:8C:2E:79:B8
  • Timestamp : Jul 9 14:09:10.829 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:B8:8D:07:FB:55:B7:21:57:39:AC:9B:
  • AD:4D:CE:7E:49:00:47:AD:15:17:84:95:25:84:18:1B:
  • 6C:8F:73:45:1D:02:20:05:FA:84:66:7F:20:89:C1:00:
  • 94:C0:41:2F:84:EF:1D:6D:F6:D8:75:AB:01:86:46:E7:
  • 5A:75:48:A1:E4:BF:6D
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 1A:04:FF:49:D0:54:1D:40:AF:F6:A0:C3:BF:F1:D8:C4:
  • 67:2F:4E:EC:EE:23:40:68:98:6B:17:40:2E:DC:89:7D
  • Timestamp : Jul 9 14:09:11.013 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:96:09:D0:34:6A:3B:C1:DD:27:0D:2A:
  • 3E:F3:FA:08:4A:95:0C:DB:90:60:DB:DC:ED:11:F4:60:
  • 61:E8:61:4C:94:02:20:53:F6:5D:25:DC:E6:A9:21:89:
  • 76:9F:78:79:05:A9:4D:EB:11:2C:5B:88:59:2C:9A:03:
  • 7A:F4:BD:E4:F3:6B:B5

DANE

DNS-based Authentication of Named Entities (DANE) is a protocol to allow X.509 certificates to be bound to DNS using TLSA records and DNSSEC.

Name Options DNSSEC Matches
_25._tcp.mail.mellstrand.se
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid