Summary of mx01.posteo.de:25 (SMTP) SSL Security Test
Provided "as is" without any warranty of any kind.
This test was made 16 days ago and may be outdated
Refresh Test
Date/Time:Apr 13th, 2026 10:53 GMT+0
Source IP/Port:185.67.36.62:25
Protocol:SMTP
Location:Kassel, Germany
Your final score:
- A
- B
- C
- F
A-
Executive Summary for mx01.posteo.de
- The server on the tested port is not currently prepared for post-quantum key exchange. The server’s certificate chain relies entirely on classical signature algorithms without post-quantum support. Show details.
- 1 SSL/TLS end-entity certificate(s) detected: the first certificate is a a trusted RSA 3072 bits certificate with issuer GeoTrust EV RSA CA G2 valid until October 6, 2026. 1 certificate chain(s) detected. Show details.
- 1 of 12 supported cipher suites are not compliant with PCI DSS. The server supports only PCI DSS compliant protocols: TLSv1.2 and TLSv1.3. All supported elliptic curves are compliant with PCI DSS: P-256, P-521, P-384, X25519 and X448. There are 1 more issue(s) which make the server non-compliant with PCI DSS: potential Marvin Attack. Show details.
- 2 of 12 supported cipher suites are not compliant with NIST and HIPAA. The server supports only NIST and HIPAA compliant protocols: TLSv1.2 and TLSv1.3. All supported elliptic curves are compliant with NIST and HIPAA: P-256, P-521, P-384, X25519 and X448. There are 1 more issue(s) which make the server non-compliant with NIST and HIPAA: server does not support OCSP stapling. Show details.
- 1 issue(s) related to industry best practices were identified: . Show details.
