vietnamairlines.com

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.

DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

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: mail01.vietnamairlines.com, mail02.vietnamairlines.com, mail03.vietnamairlines.com, mail04.vietnamairlines.com

DKIM · These keys could not be parsed, so signatures made with them will fail: selector1 (public key is not valid base64), selector2 (public key is not valid base64).

MX · These MX addresses have no PTR record, which many receivers treat as a spam signal: 52.101.137.2 (vietnamairlines-com.mail.protection.outlook.com), 2a01:111:f403:cc09::1 (vietnamairlines-com.mail.protection.outlook.com). Ask your hosting provider to set one.

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.