Mail domain report: alternate.nl

SPF

pass

SPF record published

Found

Record: v=spf1 a:mail1.tle.de a:mail.tle.de a:mail2.tle.de ip4:94.23.165.105 ip4:91.121.25.96 ip4:217.102.252.158 ip4:212.115.198.48/29 ip6:2a02:f6c:76d:1:69::7 ip6:2a02:f6c:76d:1:69::9 ip6:2a02:f6c:76d:1:69::6 -all
DNS lookups: 3 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 3 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

warn

p=quarantine (_dmarc.alternate.nl)

Found

Record: v=DMARC1; p=quarantine; rua=mailto:dmarc-aggregate@alternate.nl; ruf=mailto:dmarc-afrf@alternate.nl; pct=100
Found at: _dmarc.alternate.nl

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
pct	100	Percentage of mail the policy applies to
rua	mailto:dmarc-aggregate@alternate.nl	Aggregate report addresses
ruf	mailto:dmarc-afrf@alternate.nl	Failure report addresses

Checks

!

Policy: quarantine

DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

#4
✓ 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:dmarc-aggregate@alternate.nl
✓ Subdomain policy: quarantine #20

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

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: dkim

Found

Selectors: dkim
_domainkey: NOERROR

Selector	Key	Flags
dkim	RSA 1024 bits

Checks

✓ Keys found: dkim #7

DKIM keys found for this domain with selectors: dkim
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: dkim (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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (3)
DS at parent: Yes
Algorithms: RSASHA256 (8)
Key tags: 13590, 32065, 31344
Signatures valid until: 29 October 2026, 00:00 UTC

Checks

✓ Signed, DS published at parent #8

DNSSEC is enabled for this domain (DNSKEY and DS present), providing additional security for DNS lookups.
✓ Signatures valid until 2026-10-29 #21

DNSKEY signatures are valid until 2026-10-29T00:00:00Z.

MX

warn

3 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mx.spamexperts.com	A 149.13.75.27 AAAA 2001:978:2:7::162:100	fe1-r3-in.fra02.l.antispamcloud.com ✓ fe1-r3-in.fra02.l.antispamcloud.com ✓
20	fallbackmx.spamexperts.eu	A 154.59.193.124 A 154.59.104.23 A 149.13.75.27 AAAA 2001:978:2:6::f:124 AAAA 2001:978:2:2c::137:100 AAAA 2001:978:2:7::162:100	fe3-r3-in.du01.l.antispamcloud.com ✓ fe2-r3-in.ams14.l.antispamcloud.com ✓ fe1-r3-in.fra02.l.antispamcloud.com ✓ fe3-r3-in.du01.l.antispamcloud.com ✓ fe2-r3-in.ams14.l.antispamcloud.com ✓ fe1-r3-in.fra02.l.antispamcloud.com ✓
30	lastmx.spamexperts.net	A 38.89.254.156 A 38.71.16.244 A 149.13.75.27 A 154.59.104.23 AAAA 2001:550:2:3::62:100 AAAA 2001:978:2:7::162:100 AAAA 2001:978:2:2c::137:100 AAAA 2001:550:2:61::2fc:100	fe1-r2-in.ch03.l.antispamcloud.com ✓ fe2-r2-in.la10.l.antispamcloud.com ✓ fe1-r3-in.fra02.l.antispamcloud.com ✓ fe2-r3-in.ams14.l.antispamcloud.com ✓ fe2-r2-in.la10.l.antispamcloud.com ✓ fe1-r3-in.fra02.l.antispamcloud.com ✓ fe2-r3-in.ams14.l.antispamcloud.com ✓ no PTR

Checks

✓ 3 MX records #9

Found 3 MX records for this domain.
✓ All hosts resolve #10

All MX records resolve to valid IP addresses.
✓ All hosts have IPv6 #11

All MX records resolve to IPv6 addresses.
✓ Redundant MX hosts #12

Found 3 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 3 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.
!

Addresses without reverse DNS

These MX addresses have no PTR record, which many receivers treat as a spam signal: 2001:550:2:61::2fc:100 (lastmx.spamexperts.net). Ask your hosting provider to set one.

#30

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 3 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mx.spamexperts.com	none	-
fallbackmx.spamexperts.eu	none	-
lastmx.spamexperts.net	none	-

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
i

Not configured

TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.

#35
i

Not used

No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.

#36

BIMI

warn

https://include.alternate.nl/logo_alternate.svg

Found

Record: v=BIMI1; l=https://include.alternate.nl/logo_alternate.svg
Found at: default._bimi.alternate.nl
Logo: https://include.alternate.nl/logo_alternate.svg

Checks

!

No certificate (a=)

The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.

#38
✓ DMARC meets BIMI requirements #39

DMARC is enforced on all mail, as BIMI requires.