SSL-Tools

SSL check results of mail24.vip

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Discover if the mail servers for mail24.vip 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 Tue, 19 Aug 2025 14:58:30 +0000

The mailservers of mail24.vip can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @mail24.vip addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
server.ist-immer-online.de
2003:cc:f713:8e00:9209:d0ff:fe25:a7aa
 10
supported
server.ist-immer-online.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
8 s
server.ist-immer-online.de
79.196.251.254
 10
supported
server.ist-immer-online.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
8 s

Outgoing Mails

We have received emails from these servers with @mail24.vip sender addresses. Test mail delivery

Host TLS Version & Cipher
mout-p-102.mailbox.org (80.241.56.152)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout01.posteo.de (185.67.36.141)
TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384
mout02.posteo.de (185.67.36.142)
TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384

Certificates

First seen at:

CN=server.ist-immer-online.de

Certificate chain
  • server.ist-immer-online.de
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R11
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • server.ist-immer-online.de
Alternative Names
  • server.ist-immer-online.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R11
validity period
Not valid before
2025-07-15
Not valid after
2025-10-13
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
58:33:60:26:91:F2:80:32:68:3E:10:F1:36:CF:7F:CF:66:70:84:BC:A9:CD:A7:12:80:1E:FD:9A:6F:A7:1E:B0
SHA1
60:C9:0E:9F:BB:20:CC:F2:DC:3D:97:84:06:F0:2D:6C:26:49:A2:AC
X509v3 extensions
subjectKeyIdentifier
  • 83:11:55:B7:05:10:3D:AA:61:A8:31:A5:75:43:0C:DA:6B:26:13:5D
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/85.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : A4:42:C5:06:49:60:61:54:8F:0F:D4:EA:9C:FB:7A:2D:
  • 26:45:4D:87:A9:7F:2F:DF:45:59:F6:27:4F:3A:84:54
  • Timestamp : Jul 15 03:53:32.847 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:24:25:34:99:64:49:07:19:AF:5C:B9:37:
  • E6:80:F7:71:5D:B9:41:1F:9D:4D:23:0B:AC:21:D3:9B:
  • 9F:5F:84:C5:02:20:0C:ED:0B:52:4C:73:5C:CF:AA:2A:
  • 92:06:5A:42:36:4A:E9:A5:85:3A:F1:9E:D3:B7:A4:D2:
  • D8:EC:D8:8B:8F:14
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0D:E1:F2:30:2B:D3:0D:C1:40:62:12:09:EA:55:2E:FC:
  • 47:74:7C:B1:D7:E9:30:EF:0E:42:1E:B4:7E:4E:AA:34
  • Timestamp : Jul 15 03:53:34.848 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:32:34:90:54:1C:17:6C:B1:91:AC:41:8E:
  • 04:20:59:56:7F:6E:70:4E:08:2A:04:FC:2E:4C:17:37:
  • C5:45:E1:91:02:21:00:D9:11:0A:39:A1:7C:FE:A6:9D:
  • 51:89:06:7F:D1:34:48:53:60:F3:F3:DC:D0:D9:6B:45:
  • FB:F3:AA:FD:6C:98:5C

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.server.ist-immer-online.de
  • DANE-TA: Trust Anchor Assertion
  • Use subject public key
  • SHA-256 Hash
valid
—
_25._tcp.server.ist-immer-online.de
  • DANE-TA: Trust Anchor Assertion
  • Use subject public key
  • SHA-256 Hash
valid
valid
_25._tcp.server.ist-immer-online.de
  • DANE-TA: Trust Anchor Assertion
  • Use subject public key
  • SHA-256 Hash
valid
—
_25._tcp.server.ist-immer-online.de
  • DANE-TA: Trust Anchor Assertion
  • Use subject public key
  • SHA-256 Hash
valid
—