SSL-Tools

SSL check results of bluestars.cc

NEW You can also bulk check multiple servers.

Discover if the mail servers for bluestars.cc 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, 09 Jun 2026 00:30:30 +0000

The mailservers of bluestars.cc can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @bluestars.cc addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mx1.alias.proton.me
185.205.70.136
 10
supported
alias.proton.me
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
mx1.alias.proton.me
176.119.200.136
 10
supported
alias.proton.me
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
mx2.alias.proton.me
176.119.200.136
 20
supported
alias.proton.me
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
mx2.alias.proton.me
185.205.70.136
 20
supported
alias.proton.me
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

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

Certificates

First seen at:

CN=alias.proton.me

Certificate chain
  • alias.proton.me
    • remaining
    • 4096 bit
    • sha256WithRSAEncryption
      • R12
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • alias.proton.me
Alternative Names
  • *.alias.proton.me
  • alias.proton.me
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R12
validity period
Not valid before
2026-05-01
Not valid after
2026-07-30
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
Fingerprints
SHA256
39:AC:08:1B:5E:5E:64:69:19:80:3A:93:77:CB:F5:12:03:24:41:95:BB:1E:C8:95:5E:C7:A6:1A:77:4E:0B:1B
SHA1
D8:D1:6A:FE:66:40:80:6E:66:79:BD:AA:89:F2:A0:A6:C4:D9:81:83
X509v3 extensions
subjectKeyIdentifier
  • E9:D0:37:77:7F:92:9E:65:A8:5D:3B:95:70:B8:D3:39:6C:F1:55:BD
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/6.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : CB:38:F7:15:89:7C:84:A1:44:5F:5B:C1:DD:FB:C9:6E:
  • F2:9A:59:CD:47:0A:69:05:85:B0:CB:14:C3:14:58:E7
  • Timestamp : May 1 14:10:46.036 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:37:F4:03:91:08:DB:29:32:3B:94:4E:F1:
  • D7:E6:68:F1:19:83:DE:7E:60:A3:85:B9:91:EA:4D:76:
  • AA:1A:AD:21:02:21:00:BE:59:05:2C:EA:C2:92:6E:36:
  • A9:1A:4E:71:93:27:8D:32:E7:A5:40:CC:78:8E:7B:8C:
  • 30:59:C9:E4:5B:83:7E
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 46:AF:86:3D:3B:3E:E5:9F:A5:77:DE:A8:24:5D:36:B0:
  • D9:ED:22:A2:23:F4:61:77:41:22:94:52:EE:95:50:5F
  • Timestamp : May 1 14:10:46.130 2026 GMT
  • Extensions: 00:00:05:00:05:66:F7:E9
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:16:26:0D:3F:D1:0B:28:86:47:74:EE:A2:
  • D1:38:28:41:41:57:1E:5D:13:12:3C:40:ED:DD:3F:C3:
  • 7D:6A:7E:85:02:21:00:C1:B9:55:AC:9E:C5:71:F3:C6:
  • 1F:14:E1:5F:4E:58:E8:1A:A4:EB:53:7E:61:50:4A:52:
  • E1:B7:8E:32:BE:03:5B

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.mx1.alias.proton.me
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid
_25._tcp.mx2.alias.proton.me
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid