Email security for web4u.cz

SPF

Pass

Authorizes which servers may send mail for the domain

SPF is published and within limits.

Policy: -all
DNS lookups: 3 / 10

Ends in -all (hardfail): unauthorized senders are rejected.
Uses 3 of 10 allowed DNS lookups.

v=spf1 ip4:81.91.87.150 ip4:81.91.87.80 ip4:81.91.87.60 ip4:81.91.87.250 ip4:81.91.87.34/31 ip4:81.91.87.249 ip4:81.91.87.236 ip6:2001:1568:502:1::/64 ip6:2001:1568:502:2::/64 ip6:2001:1568:502:3::/64 ip6:2001:1568::7060 ip6:2001:1568::7236 ip4:77.78.104.121 ip6:2001:1528:137::a include:_spf.jupiter.salesmanago.pl -all

DKIM

Pass

Cryptographically signs outgoing mail (best-effort selector probe)

DKIM key published for 3 known selectors.

Selectors: default, s1, s2

Found a DKIM key at default._domainkey.web4u.cz
Found a DKIM key at s1._domainkey.web4u.cz
Found a DKIM key at s2._domainkey.web4u.cz

DMARC

Pass

Tells receivers what to do with mail that fails SPF and DKIM

DMARC is enforced.

Policy: p=reject
Subdomains: sp=none
Coverage: 100%

Policy p=reject: failing mail is rejected outright.
Aggregate reports (rua) are configured.

v=DMARC1;p=reject;sp=none;pct=100;adkim=s;aspf=r;rua=mailto:[email protected];ruf=mailto:[email protected]

MTA-STS

Pass

Enforces TLS for inbound mail and prevents downgrade attacks

MTA-STS is enforcing TLS.

Mode: enforce
Max age: 604800s

Policy mode is enforce: TLS is required for inbound mail.

v=STSv1; id=20260915122200;

TLS-RPT

Not set

Receives reports about TLS delivery failures

No TLS-RPT record. You get no reports about failed TLS delivery.

BIMI

Not set

Displays your verified brand logo in supporting inboxes

No BIMI record. No brand logo is published for inboxes.