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SSL check results of btw.tf

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Discover if the mail servers for btw.tf 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, 10 Oct 2025 00:31:00 +0000

The mailservers of btw.tf can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @btw.tf addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.bielej.org
195.154.118.20
 10
supported
bielej.org
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
3 s

Outgoing Mails

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

Certificates

First seen at:

CN=bielej.org

Certificate chain
  • bielej.org
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R13
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • bielej.org
Alternative Names
  • *.bielej.org
  • bielej.org
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R13
validity period
Not valid before
2025-09-08
Not valid after
2025-12-07
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
24:50:C4:8C:7C:12:42:07:F0:85:34:1D:9B:B3:17:CD:99:17:A5:24:39:58:A4:24:65:19:3E:BC:9A:88:B4:1D
SHA1
A0:F4:B1:4F:D2:87:A7:28:C9:C8:E4:72:EF:10:C6:A0:78:4A:54:61
X509v3 extensions
subjectKeyIdentifier
  • 5F:D7:A6:4D:DA:A6:8F:D0:2A:40:E8:9E:B2:EA:F2:A6:6F:DB:00:E9
authorityKeyIdentifier
  • keyid:E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
  • CA Issuers - URI:http://r13.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r13.c.lencr.org/17.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : ED:3C:4B:D6:E8:06:C2:A4:A2:00:57:DB:CB:24:E2:38:
  • 01:DF:51:2F:ED:C4:86:C5:70:0F:20:DD:B7:3E:3F:E0
  • Timestamp : Sep 8 05:00:09.813 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:D7:0D:8A:03:E9:5A:D1:2C:D1:28:C2:
  • 6D:4F:A7:A1:3D:E5:E3:80:6B:69:F9:4B:A1:DB:3B:D6:
  • 5D:B0:D7:BC:7E:02:21:00:A3:C9:07:7F:5F:68:ED:E6:
  • 7A:2E:B8:38:00:5D:33:AC:54:E7:5F:23:24:94:A0:97:
  • A4:94:82:CB:B1:C2:E2:E0
  • 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 : Sep 8 05:00:09.871 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:3C:93:5D:21:54:C6:1D:7B:25:7D:E0:58:
  • B4:60:28:D1:9A:38:EE:30:22:2E:5A:20:F7:7A:64:A4:
  • 97:DA:C0:51:02:21:00:88:04:79:D4:A2:CE:D2:76:A6:
  • 07:16:CD:27:9D:3F:96:95:BC:CB:22:CE:6D:6C:90:BB:
  • 8A:5E:24:63:A0:FC:60