Summary of mx01.posteo.de:25 (SMTP) SSL Security Test
Provided "as is" without any warranty of any kind.
This test was made 111 days ago and may be outdated
Refresh Test
Date/Time:Jul 16th, 2026 18:19 GMT+0
Source IP/Port:185.67.36.62:25
Protocol:SMTP
Location:Kassel, Germany
Your final score:
- A
- B
- C
- F
A-
Email server's SPF and DMARC are properly set.
Good configuration
The server supports the most recent and secure TLS protocol version of TLS 1.3.
Good configuration
The tested service seems to be a SMTP.
Information
Test Results Summary for mx01.posteo.de
- The server on the tested port is currently not 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 detected: the first certificate is a trusted RSA 3072 bits certificate with issuer GeoTrust EV RSA CA G2 valid until October 6, 2026. 1 certificate chain detected. Show details.
- 1 of 12 supported cipher suites is 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 is 1 more issue which makes the server non-compliant with PCI DSS: potential Marvin Attack. Show details.
- 2 of 12 supported cipher suites are not compliant with HIPAA requirements (Ref. NIST SP 800-52). The server supports only HIPAA compliant protocols: TLSv1.2 and TLSv1.3. All supported elliptic curves are compliant with HIPAA: P-256, P-521, P-384, X25519 and X448. There is 1 more issue which makes the server non-compliant with HIPAA: server does not support OCSP stapling. Show details.
- 1 issue related to industry best practices was identified: server supports client-initiated secure renegotiation. Show details.
Compliance Summary for mx01.posteo.de
- PCI DSS Compliance Failed: 1 of 12 supported cipher suites is 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 is 1 more issue which makes the server non-compliant with PCI DSS: potential Marvin Attack.
- HIPAA Compliance Failed: 2 of 12 supported cipher suites are not compliant with HIPAA requirements (Ref. NIST SP 800-52). The server supports only HIPAA compliant protocols: TLSv1.2 and TLSv1.3. All supported elliptic curves are compliant with HIPAA: P-256, P-521, P-384, X25519 and X448. There is 1 more issue which makes the server non-compliant with HIPAA: server does not support OCSP stapling.
- GDPR Compliance Failed: 1 of 12 supported cipher suites is not compliant with GDPR. The server supports only GDPR compliant protocols: TLSv1.2 and TLSv1.3. All supported elliptic curves are compliant with GDPR: P-256, P-521, P-384, X25519 and X448. There is 1 more issue which makes the server non-compliant with GDPR: potential Marvin Attack.
