kalmthout.be

DNSSEC · NSEC3 uses 5 iterations and a 4-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: d302744.a.ess.de.barracudanetworks.com, d302744.b.ess.de.barracudanetworks.com

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits), selector2 (1024 bits). Rotate to a 2048-bit key.

DMARC · These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:rua+kalmthout.be@dmarc.barracudanetworks.com (needs kalmthout.be._report._dmarc.dmarc.barracudanetworks.com); mailto:ruf+kalmthout.be@dmarc.barracudanetworks.com (needs kalmthout.be._report._dmarc.dmarc.barracudanetworks.com). 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.