siemens.com

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-16.akam.net: "41824.11"; a1-16.akam.net: "41824.6"; a10-64.akam.net: "48878.30"; a10-64.akam.net: "48878.32"; a11-66.akam.net: "41824.5"; a13-65.akam.net: "41824.6"; a13-65.akam.net: "41824.11"; a2-67.akam.net: "48878.32"; a2-67.akam.net: "48878.29"; a28-65.akam.net: "48878.29"; a28-65.akam.net: "48878.31". Hide or replace the version string.

DNSSEC · NSEC3 uses 10 iterations and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

MX · The following MX hosts could not be resolved to IPv6 addresses: siemens-com.h-v1.mx.microsoft

MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits). Rotate to a 2048-bit key.

TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.

TLS · MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".