SSL-Tools

SSL check results of cfromm.de

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Discover if the mail servers for cfromm.de 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, 20 Apr 2023 18:15:07 +0000

The mailservers of cfromm.de can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @cfromm.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.protonmail.ch
185.70.42.128
 10
supported
protonmail.com
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
36 s
mail.protonmail.ch
185.205.70.128
 10
supported
protonmail.com
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
30 s
mail.protonmail.ch
176.119.200.128
 10
supported
protonmail.com
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
36 s
mailsec.protonmail.ch
176.119.200.129
 20
supported
protonmail.com
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
7 s
mailsec.protonmail.ch
185.70.42.129
 20
supported
protonmail.com
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
7 s
mailsec.protonmail.ch
185.205.70.129
 20
supported
protonmail.com
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
7 s

Outgoing Mails

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

Certificates

First seen at:

CN=protonmail.com

Certificate chain
  • protonmail.com
    • remaining
    • 4096 bit
    • sha256WithRSAEncryption
      • R3
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • protonmail.com
Alternative Names
  • *.pm.me
  • *.protonmail.ch
  • *.protonmail.com
  • *.protonvpn.ch
  • *.protonvpn.com
  • protonmail.com
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R3
validity period
Not valid before
2023-04-03
Not valid after
2023-07-02
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
48:41:21:3C:2A:11:2C:F5:3F:33:A1:20:A3:26:07:20:CA:F9:A1:5B:E8:E2:A6:F9:6B:0E:28:3E:96:6C:7D:88
SHA1
2F:7B:1A:BC:2F:7F:F5:79:C5:06:A0:99:3A:A4:A9:42:0B:46:35:74
X509v3 extensions
subjectKeyIdentifier
  • 33:36:13:CB:1C:5C:7A:BD:79:9C:FB:E5:1D:DB:AB:5F:C6:66:41:06
authorityKeyIdentifier
  • keyid:14:2E:B3:17:B7:58:56:CB:AE:50:09:40:E6:1F:AF:9D:8B:14:C2:C6
authorityInfoAccess
  • OCSP - URI:http://r3.o.lencr.org
  • CA Issuers - URI:http://r3.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
  • Policy: 1.3.6.1.4.1.44947.1.1.1
  • CPS: http://cps.letsencrypt.org
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 7A:32:8C:54:D8:B7:2D:B6:20:EA:38:E0:52:1E:E9:84:
  • 16:70:32:13:85:4D:3B:D2:2B:C1:3A:57:A3:52:EB:52
  • Timestamp : Apr 3 16:43:32.434 2023 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:0B:94:B9:82:4D:A2:22:25:4D:70:F3:84:
  • 2C:51:B4:FF:7A:63:E2:9D:60:EF:FB:98:06:FD:D3:76:
  • 71:5B:5C:D5:02:20:03:F6:BF:44:3B:B8:D1:05:02:F0:
  • FE:3D:E0:20:74:42:46:10:4D:85:39:43:18:4C:3B:D1:
  • 9F:F6:50:B1:7C:1A
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : E8:3E:D0:DA:3E:F5:06:35:32:E7:57:28:BC:89:6B:C9:
  • 03:D3:CB:D1:11:6B:EC:EB:69:E1:77:7D:6D:06:BD:6E
  • Timestamp : Apr 3 16:43:32.412 2023 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:93:2D:06:0A:2F:B8:7F:AD:D8:06:EB:
  • C5:D9:F0:14:2E:2C:B6:E6:BA:9A:02:99:0C:85:34:52:
  • A4:3D:6F:61:FC:02:20:11:11:2E:25:D9:2E:F7:61:E6:
  • 18:92:C0:6C:02:B9:9D:85:98:14:90:F4:26:B5:AC:5E:
  • 7D:95:DE:93:23:99:A9

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.mailsec.protonmail.ch
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
—
_25._tcp.mailsec.protonmail.ch
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid
_25._tcp.mail.protonmail.ch
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid
_25._tcp.mail.protonmail.ch
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
—