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, 28 Oct 2025 11:30:54 +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:f719:500:9209: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
7 s
server.ist-immer-online.de
79.196.242.15
 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
7 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
      • R12
        • 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)
  • R12
validity period
Not valid before
2025-08-30
Not valid after
2025-11-28
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
84:38:72:BA:B8:D6:AE:04:4D:9A:4C:9B:8B:5E:E7:90:76:B4:B3:0A:73:0E:8D:3F:64:0E:D7:91:71:A9:60:4B
SHA1
DE:52:E9:9B:86:F1:77:3D:51:27:29:BC:12:18:F3:6F:F6:6B:DA:17
X509v3 extensions
subjectKeyIdentifier
  • 77:13:7D:4D:D5:AA:CC:D9:92:86:C5:33:42:67:94:54:77:36:8D:F6
authorityKeyIdentifier
  • keyid:00:B5:29:F2:2D:8E:6F:31:E8:9B:4C:AD:78:3E:FA:DC:E9:0C:D1:D2
authorityInfoAccess
  • CA Issuers - URI:http://r12.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r12.c.lencr.org/29.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 12:F1:4E:34:BD:53:72:4C:84:06:19:C3:8F:3F:7A:13:
  • F8:E7:B5:62:87:88:9C:6D:30:05:84:EB:E5:86:26:3A
  • Timestamp : Aug 31 00:08:39.101 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:93:81:4B:5C:74:FE:25:10:54:8A:D7:
  • AC:15:40:F1:76:7A:29:D6:64:D3:4A:98:E7:66:8A:08:
  • E8:48:9C:59:A2:02:20:4B:43:93:06:F0:9D:10:72:1A:
  • 3E:4F:57:DE:D7:19:21:D9:97:BB:37:28:BC:78:2E:09:
  • 3B:75:C0:0A:DB:6E:9E
  • 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 : Aug 31 00:08:39.200 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:DC:D3:10:95:56:B8:6F:9F:FD:2E:0C:
  • BE:5F:BE:CD:B1:14:A9:B7:3D:56:ED:30:5A:BD:0C:A3:
  • 21:9D:7D:0B:55:02:20:2B:D7:84:DA:3C:1D:79:6C:E6:
  • A6:64:E2:CE:30:E4:73:D9:2B:D2:53:00:32:11:8D:ED:
  • 30:74:8E:35:D0:5E:D5

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