SSL-Tools

SSL check results of smtp.1und1.de

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Discover if the mail servers for smtp.1und1.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 Sun, 28 Apr 2024 19:09:38 +0000

The mailservers of smtp.1und1.de can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @smtp.1und1.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
smtp.1und1.de
212.227.15.183
 -
supported
smtp.1und1.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
smtp.1und1.de
212.227.15.167
 -
supported
smtp.1und1.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

We have not received any emails from a @smtp.1und1.de address so far. Test mail delivery

Certificates

First seen at:

CN=smtp.1und1.de,L=Montabaur,ST=Rheinland-Pfalz,O=IONOS SE,C=DE

Certificate chain
Subject
Country (C)
  • DE
Organization (O)
  • IONOS SE
State (ST)
  • Rheinland-Pfalz
Locality (L)
  • Montabaur
Common Name (CN)
  • smtp.1und1.de
Alternative Names
  • smtp.1und1.de
Issuer
Country (C)
  • DE
Organization (O)
  • Deutsche Telekom Security GmbH
Common Name (CN)
  • Telekom Security ServerID OV Class 2 CA
validity period
Not valid before
2023-06-20
Not valid after
2024-06-24
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Client Authentication
  • TLS Web Server Authentication
Fingerprints
SHA256
2A:3A:28:2C:EB:7F:81:E5:AF:7D:4D:0C:3C:B9:60:74:31:01:EE:3B:C0:81:C9:DF:3E:B2:C9:49:55:C7:0D:7E
SHA1
E8:EF:77:43:DE:EE:E9:CB:EC:E8:30:A3:6E:65:41:3E:69:DF:8A:F0
X509v3 extensions
authorityKeyIdentifier
  • keyid:1C:05:93:B1:7F:A8:34:30:8C:52:E0:96:40:A0:72:A3:10:5D:E0:FF
subjectKeyIdentifier
  • 93:D0:7A:6C:46:7B:E9:D0:DE:D2:C6:4C:CE:1F:0C:C2:A3:49:D7:DC
certificatePolicies
  • Policy: 2.23.140.1.2.2
  • CPS: http://docs.serverid.telesec.de/cps/serverid.htm
crlDistributionPoints
  • Full Name:
  • URI:http://crl.serverid.telesec.de/rl/Telekom_Security_ServerID_OV_Class_2_CA.crl
authorityInfoAccess
  • OCSP - URI:http://ocsp.serverid.telesec.de/ocspr
  • CA Issuers - URI:http://crt.serverid.telesec.de/crt/Telekom_Security_ServerID_OV_Class_2_CA.crt
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : EE:CD:D0:64:D5:DB:1A:CE:C5:5C:B7:9D:B4:CD:13:A2:
  • 32:87:46:7C:BC:EC:DE:C3:51:48:59:46:71:1F:B5:9B
  • Timestamp : Jun 20 09:22:11.907 2023 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:C7:95:62:AC:46:24:74:92:07:88:09:
  • 92:FA:72:04:F4:85:27:A9:FE:E4:B1:3E:E2:3C:4E:3A:
  • A4:63:92:AB:6E:02:21:00:C0:CB:94:A3:DF:06:D4:DC:
  • 68:DD:41:62:72:E0:49:4A:9E:36:A1:8C:62:52:76:27:
  • EC:90:76:AA:DD:03:F5:6C
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 76:FF:88:3F:0A:B6:FB:95:51:C2:61:CC:F5:87:BA:34:
  • B4:A4:CD:BB:29:DC:68:42:0A:9F:E6:67:4C:5A:3A:74
  • Timestamp : Jun 20 09:22:11.854 2023 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:0F:EC:E5:52:62:E4:81:D8:4F:76:6A:DA:
  • 5F:6E:69:99:E1:D6:EA:83:D9:2C:DD:68:E4:2D:1A:6F:
  • C4:4B:05:01:02:20:76:50:12:65:F5:27:30:A8:2C:DC:
  • B4:F2:97:79:C5:98:FB:8C:A4:44:06:B5:B4:DC:1B:FD:
  • B2:DB:86:59:23:3A
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 55:81:D4:C2:16:90:36:01:4A:EA:0B:9B:57:3C:53:F0:
  • C0:E4:38:78:70:25:08:17:2F:A3:AA:1D:07:13:D3:0C
  • Timestamp : Jun 20 09:22:12.142 2023 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:28:22:4F:94:5F:A1:FE:FC:7F:40:FA:8E:
  • 07:77:89:BB:E6:F1:FC:21:63:EF:F8:4C:2A:CF:56:F6:
  • A8:A6:C3:2A:02:21:00:D4:0A:C9:D7:12:9F:01:C2:E6:
  • 06:AF:06:4B:4B:BE:67:36:64:C3:BE:D9:79:F7:C1:74:
  • 67:95:50:B8:BF:63:4F
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : DA:B6:BF:6B:3F:B5:B6:22:9F:9B:C2:BB:5C:6B:E8:70:
  • 91:71:6C:BB:51:84:85:34:BD:A4:3D:30:48:D7:FB:AB
  • Timestamp : Jun 20 09:22:12.443 2023 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:31:F7:19:52:50:9A:AB:F1:CF:C7:B7:23:
  • 94:6D:3B:00:69:B6:4F:CC:86:6D:19:23:09:04:FD:C3:
  • A2:C6:BF:F0:02:21:00:C7:CA:92:0B:6F:70:C6:B9:73:
  • E4:C2:8C:21:E4:DB:82:49:58:DF:DC:FC:4E:EB:C3:95:
  • 87:18:D5:D6:11:FB:26