SSL-Tools

SSL check results of ascus.com.sg

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Discover if the mail servers for ascus.com.sg 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, 09 Aug 2026 00:30:47 +0000

The mailservers of ascus.com.sg can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @ascus.com.sg addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mx-biz.mail.am0.yahoodns.net
67.195.204.83
 20
supported
*.mail.am0.yahoodns.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
6 s
mx-biz.mail.am0.yahoodns.net
67.195.228.75
 20
supported
*.mail.am0.yahoodns.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
9 s
mx-biz.mail.am0.yahoodns.net
67.195.204.83
 30
supported
*.mail.am0.yahoodns.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
6 s
mx-biz.mail.am0.yahoodns.net
67.195.228.75
 30
supported
*.mail.am0.yahoodns.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
9 s

Outgoing Mails

We have not received any emails from a @ascus.com.sg address so far. Test mail delivery

Certificates

First seen at:

CN=*.mail.am0.yahoodns.net,O=Yahoo Holdings Inc.,L=New York,ST=New York,C=US

Certificate chain
Subject
Country (C)
  • US
State (ST)
  • New York
Locality (L)
  • New York
Organization (O)
  • Yahoo Holdings Inc.
Common Name (CN)
  • *.mail.am0.yahoodns.net
Alternative Names
  • *.mail.am0.yahoodns.net
  • *.am0.yahoodns.net
  • *.sbcglobal.am0.yahoodns.net
  • *.mail.gm0.yahoodns.net
  • *.gm0.yahoodns.net
  • *.biz.mail.yahoo.com
  • *.bullet.am0.yahoodns.net
  • *.mta.mail.yahoo.com
Issuer
Country (C)
  • US
Organization (O)
  • DigiCert Inc
Common Name (CN)
  • DigiCert Global G2 TLS RSA SHA256 2020 CA1
validity period
Not valid before
2026-07-21
Not valid after
2027-01-13
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
94:9B:CB:18:D8:F8:52:18:2D:23:F4:90:14:27:B7:CA:3E:B8:A5:CD:FC:DD:32:9E:CB:3B:4B:EF:9B:F8:37:7B
SHA1
01:03:B9:D0:1D:53:91:AA:94:BF:15:F9:8B:AD:1B:8B:91:62:82:2C
X509v3 extensions
authorityKeyIdentifier
  • keyid:74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
subjectKeyIdentifier
  • 3E:DF:D6:3E:C7:A5:66:14:EA:5B:53:A1:8C:D3:10:AC:09:21:64:F3
certificatePolicies
  • Policy: 2.23.140.1.2.2
  • CPS: http://www.digicert.com/CPS
crlDistributionPoints
  • Full Name:
  • URI:http://crl3.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl
  • Full Name:
  • URI:http://crl4.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl
authorityInfoAccess
  • OCSP - URI:http://ocsp.digicert.com
  • CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crt
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F:
  • AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26
  • Timestamp : Jul 21 00:08:14.571 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:6A:1C:36:CD:61:DD:09:5C:D6:C0:27:68:
  • AD:3B:DE:0C:40:F6:06:8A:24:5D:45:36:6E:0E:90:D6:
  • A6:DF:BD:80:02:21:00:D9:02:B7:7C:88:35:04:0E:E4:
  • D6:10:5E:C6:B4:30:89:1C:57:F4:C6:FA:61:E0:55:31:
  • 82:37:05:25:1E:EA:D3
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF:
  • EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02
  • Timestamp : Jul 21 00:08:14.755 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:F3:66:5E:B0:F8:CB:EB:B4:C0:81:B0:
  • E1:2E:53:F8:29:91:6B:CD:DE:4E:E6:B1:49:D7:C4:B6:
  • EA:3C:A6:31:55:02:20:2F:37:C8:D3:14:B1:88:0E:2B:
  • E6:EC:C8:8D:D6:F8:4C:EA:32:0D:C3:B7:2F:34:CD:D2:
  • 0C:2B:B7:81:FF:1E:E8
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD:
  • DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F
  • Timestamp : Jul 21 00:08:14.796 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:4B:41:07:BD:D4:5D:DD:3A:E7:49:95:B8:
  • 92:24:BB:D5:DE:19:CD:C3:D1:78:30:9B:72:69:E6:FC:
  • B3:BC:EF:96:02:20:51:B3:3E:74:02:E3:35:85:3F:B2:
  • E5:D3:77:45:E8:AD:00:4F:5C:0C:A7:19:CA:91:DB:B5:
  • 98:73:03:05:61:F3