Mail domain report: cyberinstitut.fr

SPF

pass

SPF record published

Found

Record: v=spf1 mx include:send.aweber.com include:spf.sendinblue.com include:_spf.protonmail.ch -all
DNS lookups: 5 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✓ 5 of 10 DNS lookups #2

SPF record needs 5 DNS lookups (limit is 10).
✓ Ends with -all #3

SPF record properly uses -all to restrict unauthorized senders.
✓ Record published #6

SPF record exists for this domain.
✓ Single record #16

Exactly one SPF record is published.
✓ Valid syntax #25

All SPF mechanisms and modifiers are valid.
✓ No void lookups #26

All include/redirect targets exist.
✓ No overly broad IP ranges #27

All ip4/ip6 ranges are narrow enough.

DMARC

pass

p=reject (_dmarc.cyberinstitut.fr)

Found

Record: v=DMARC1;p=reject;rua=mailto:contact@cyberinstitut.fr;sp=reject;adkim=r;aspf=r;pct=100;fo=0;rf=afrf;ri=86400
Found at: _dmarc.cyberinstitut.fr

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
sp	reject	Subdomain policy
pct	100	Percentage of mail the policy applies to
rua	mailto:contact@cyberinstitut.fr	Aggregate report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)
fo	0	Failure reporting options
rf	afrf	Failure report format
ri	86400	Report interval (seconds)

Checks

✓ Policy: reject #4

DMARC policy is set to 'reject', which provides the strongest protection against email spoofing.
✓ Record published #5

DMARC record exists for this domain.
✓ Valid syntax #17

DMARC record syntax is valid.
✓ Applies to 100% of mail #18

DMARC policy applies to all failing mail.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:contact@cyberinstitut.fr
✓ Subdomain policy: reject #20

Subdomains are covered by policy 'reject'.
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: default, mail

Found

Selectors: default, mail
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 2048 bits
mail	RSA 1024 bits

Checks

✓ Keys found: default, mail #7

DKIM keys found for this domain with selectors: default, mail
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits). Rotate to a 2048-bit key.

#23
✓ No problematic flags #24

No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

warn

Signed, but no DS at parent

Found

DNSKEY records: Yes (2)
DS at parent: No
Algorithms: ECDSAP256SHA256 (13)
Key tags: 2371, 34505
Signatures valid until: 15 December 2026, 21:51 UTC

Checks

!

Signed, but no DS at parent

The zone is signed (DNSKEY present) but the parent has no DS record, so the chain of trust is incomplete. Publish the DS record at your registrar.

#8
✓ Signatures valid until 2026-12-15 #21

DNSKEY signatures are valid until 2026-12-15T21:51:17Z.

MX

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mail.protonmail.ch	A 185.205.70.128 A 185.70.42.128 A 176.119.200.128	mail.protonmail.ch ✓ mail.protonmail.ch ✓ mail.protonmail.ch ✓
20	mailsec.protonmail.ch	A 185.70.42.129 A 176.119.200.129 A 185.205.70.129	mailsec.protonmail.ch ✓ mailsec.protonmail.ch ✓ mailsec.protonmail.ch ✓

Checks

✓ 2 MX records #9

Found 2 MX records for this domain.
✓ All hosts resolve #10

All MX records resolve to valid IP addresses.
!

Hosts without IPv6

The following MX hosts could not be resolved to IPv6 addresses: mail.protonmail.ch, mailsec.protonmail.ch

#11
✓ Redundant MX hosts #12

Found 2 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 2 MX records, which is within the recommended range (1-5).
✓ No localhost targets #14

No MX records pointing to localhost found.
✓ No private IP addresses #15

No MX records resolving to private IP addresses found.
✓ No CNAME targets #22

No MX records point to a CNAME.
✓ Reverse DNS confirmed #30

All 6 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 2 of 2 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mail.protonmail.ch	3 1 1 76bb66711da41643… 3 1 1 6111a5698d23c89e…	Yes
mailsec.protonmail.ch	3 1 1 6111a5698d23c89e… 3 1 1 76bb66711da41643…	Yes

Checks

!

Not configured

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.

#32
!

Not configured

MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".

#35
✓ DANE on all MX hosts #36

All 2 MX hosts publish DNSSEC-validated TLSA records.

BIMI

info

No BIMI record

Checks

i

Not configured

BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.

#38