t-mobile.com

Delegation · The addresses at the parent (glue) differ from the addresses in the zone: auth2.dns.cogentco.com (glue 66.28.0.30, zone 66.28.0.30, 2001:550:1:b::d). Update the glue at your registrar.

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-167.akam.net: "41824.9"; a13-67.akam.net: "41824.8"; a13-67.akam.net: "41824.9"; a14-65.akam.net: "48878.26"; a14-65.akam.net: "48878.33"; a6-66.akam.net: "48878.27"; a6-66.akam.net: "48878.33"; a7-65.akam.net: "41824.7"; a7-65.akam.net: "41824.5"; a8-66.akam.net: "48878.29"; a8-66.akam.net: "48878.27". Hide or replace the version string.

DNSSEC · The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

MX · The following MX hosts could not be resolved to IPv6 addresses: mxa-00025704.gslb.pphosted.com, mxb-00025704.gslb.pphosted.com

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits), 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.