douglas.nl

Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: ns1.netnames.net, ns2.netnames.net, ns5.netnames.net, ns6.netnames.net; only in the zone: pdns1.cscdns.net, pdns2.cscdns.net. ns1.netnames.net, ns2.netnames.net, ns5.netnames.net, ns6.netnames.net, pdns1.cscdns.net, pdns2.cscdns.net report NS pdns1.cscdns.net pdns2.cscdns.net.

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.

SPF · SPF record needs 10 DNS lookups (limit is 10). Problems found: include:spf.flowmailer.ne does not exist or has no records.

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

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.

SPF · 1 include/redirect target does not exist or has no records (limit is 2). This usually is a stale include; remove it.

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.