arminia-bielefeld.de

Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: linbicos.bicos.de; only in the zone: ns1.bicos.de. linbicos.bicos.de, ns1.bicos.de, ns2.bicos.de, ns4.bicos.de report NS ns1.bicos.de ns2.bicos.de ns4.bicos.de.

SOA · expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 8h, retry 2h, expire 1h, negative TTL 1d.

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: mx01.hornetsecurity.com, mx02.hornetsecurity.com, mx03.hornetsecurity.com, mx04.hornetsecurity.com

DMARC · These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:it@arminia.de (needs arminia-bielefeld.de._report._dmarc.arminia.de). Ask the report provider to publish the record, or check the address.

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.