SSL-Tools

SSL check results of dual.de

NEW You can also bulk check multiple servers.

Discover if the mail servers for dual.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, 29 Jul 2021 07:51:47 +0000

We can not guarantee a secure connection to the mailservers of dual.de!

Please contact the operator of dual.de and ask him or her to solve this problem. This result stays accessible under the following address:

/mailservers/dual.de

Servers

Incoming Mails

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

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.dual.de
62.245.201.226
 10
supported
mail.dgc-electronics.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
supported
  • ECDHE_RSA_WITH_RC4_128_SHA
  • SSL_RSA_EXPORT_WITH_RC4_40_MD5
  • SSL_RSA_WITH_RC4_128_SHA
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
12 s
mail2.dual.de
62.245.201.227
Results incomplete
20 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
11 s

Outgoing Mails

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

Certificates

First seen at:

CN=mail.dgc-electronics.de

Certificate chain
  • mail.dgc-electronics.de (Certificate is self-signed.)
    • remaining
    • 2048 bit
    • sha1WithRSAEncryption
    • Hostname Mismatch
    • Expired
    • Unknown Authority
Subject
Common Name (CN)
  • mail.dgc-electronics.de
Issuer

Certificate is self-signed.

validity period
Not valid before
2016-04-14
Not valid after
1902-03-04
Fingerprints
SHA256
D9:AB:D5:96:80:52:A6:FE:B2:55:EB:D5:A3:2D:6F:89:09:3B:73:48:B9:F4:8D:1C:A8:F5:08:60:4E:3A:B4:E7
SHA1
46:E9:5B:38:23:D2:51:62:A8:AE:37:8F:F7:38:B4:01:F8:6F:74:FE
X509v3 extensions
subjectKeyIdentifier
  • B2:19:D5:03:D4:F9:39:6C:4B:4C:F6:B9:E4:60:FC:33:00:0D:7B:05
authorityKeyIdentifier
  • keyid:B2:19:D5:03:D4:F9:39:6C:4B:4C:F6:B9:E4:60:FC:33:00:0D:7B:05
  • DirName:/CN=mail.dgc-electronics.de
  • serial:9A:53:C5:8F:B2:26:25:87