Mail domain report: springernature.com

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:185.132.180.79/32 ip4:185.183.28.43/32 ip4:192.87.127.46/32 ip4:192.87.127.243/32 ip4:192.87.127.244/32 ip4:63.116.214.22/32 ip4:63.116.214.22/32 ip4:195.128.10.15/32 ip4:195.128.10.18/32 ip4:195.128.10.69/32 ip4:199.168.14.54/32 ip4:208.185.229.0/24 ip4:188.94.250.251/32 ip4:208.185.235.0/24 ip4:167.89.16.99/32 ip4:52.34.66.236/32 ip4:81.93.173.201 ip4:81.93.164.103 ip4:188.94.250.252 ip4:192.174.90.91/32 ip4:66.159.232.113/32 ip4:66.159.234.15/32 ip4:195.128.10.25/32 ip4:195.128.10.24/32 ip4:195.128.10.23/32 ip4:192.174.90.92/32 ip4:46.33.81.176/29 ip4:213.200.109.64/27 ip4:46.33.88.16/29 ip4:77.67.50.0/27 ip4:89.187.106.224/27 ip4:88.84.157.248/29 ip4:88.84.158.0/27 ip4:87.253.232.0/21 ip4:54.229.2.165 ip4:52.30.130.201 ip4:94.130.108.177/32 ip4:185.189.236.0/22 ip4:185.211.120.0/22 ip4:185.250.236.0/22 include:_spf.salesforce.com include:trustpilotservice.com include:spf.mandrillapp.com include:_spf.google.com include:_spfi.evolver.de include:servers.mcsv.net -all
DNS lookups: 7 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 7 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=reject (_dmarc.springernature.com)

Found

Record: v=DMARC1; p=reject; rua=mailto:re+qcbmge2ujns@dmarc.postmarkapp.com,mailto:dmarc_agg@vali.email; pct=100; sp=none; aspf=r
Found at: _dmarc.springernature.com
External report address: mailto:re+qcbmge2ujns@dmarc.postmarkapp.com (authorized)
External report address: mailto:dmarc_agg@vali.email (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
sp	none	Subdomain policy
pct	100	Percentage of mail the policy applies to
rua	mailto:re+qcbmge2ujns@dmarc.postmarkapp.com,mailto:dmarc_agg@vali.email	Aggregate report addresses
aspf	r	SPF alignment (r = relaxed, s = strict)

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:re+qcbmge2ujns@dmarc.postmarkapp.com, mailto:dmarc_agg@vali.email
!

Subdomains unprotected (sp=none)

DMARC subdomain policy is sp=none, so spoofed mail from subdomains is not blocked. Consider sp=quarantine or sp=reject.

#20
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: mail, k1, selector1, google, s1, s2

Found

Selectors: mail, k1, selector1, google, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 1024 bits
k1	RSA 1024 bits
selector1	RSA 1024 bits
google	RSA 1024 bits
s1	RSA 2048 bits
s2	RSA 2048 bits

Checks

✓ Keys found: mail, k1, selector1, google, s1, s2 #7

DKIM keys found for this domain with selectors: mail, k1, selector1, google, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits), k1 (1024 bits), selector1 (1024 bits), google (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

Not signed

Found

DNSKEY records: No (0)
DS at parent: No

Checks

!

Not enabled

DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

#8

MX

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mxa-002c5801.gslb.pphosted.com	A 185.183.28.43	mx08-002c5801.pphosted.com ✓
10	mxb-002c5801.gslb.pphosted.com	A 185.132.180.79	mx07-002c5801.pphosted.com ✓

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: mxa-002c5801.gslb.pphosted.com, mxb-002c5801.gslb.pphosted.com

#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 2 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mxa-002c5801.gslb.pphosted.com	none	-
mxb-002c5801.gslb.pphosted.com	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

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