Mail domain report: nybooks.com

SPF

pass

SPF record published

Found

Record: v=spf1 a mx ip4:199.33.226.0/24 ip4:12.15.39.200/29 include:spf.protection.outlook.com include:_spf.createsend.com include:shops.shopify.com include:amazonses.com include:51780890.spf05.hubspotemail.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=quarantine (_dmarc.nybooks.com)

Found

Record: v=DMARC1; p=quarantine; rua=mailto:63850060df893@ag.dmarcly.com,mailto:ipm5rug@ar.glockapps.com; ruf=mailto:63850060df893@fo.dmarcly.com; sp=quarantine;
Found at: _dmarc.nybooks.com
External report address: mailto:63850060df893@ag.dmarcly.com (authorized)
External report address: mailto:ipm5rug@ar.glockapps.com (authorized)
External report address: mailto:63850060df893@fo.dmarcly.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
sp	quarantine	Subdomain policy
rua	mailto:63850060df893@ag.dmarcly.com,mailto:ipm5rug@ar.glockapps.com	Aggregate report addresses
ruf	mailto:63850060df893@fo.dmarcly.com	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:63850060df893@ag.dmarcly.com, mailto:ipm5rug@ar.glockapps.com
✓ Subdomain policy: quarantine #20

Subdomains are covered by policy 'quarantine'.
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: selector1, selector2

Found

Selectors: selector1, selector2
_domainkey: NOERROR

Selector	Key	Flags
selector1	RSA 2048 bits
selector2	RSA 1024 bits

Checks

✓ Keys found: selector1, selector2 #7

DKIM keys found for this domain with selectors: selector1, selector2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: selector2 (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

info

DNS query for nybooks.com failed: read udp 46.225.38.91:43032->8.8.8.8:53: i/o timeout

Checks

i

Could not be checked

The DNSSEC lookup failed, so this could not be checked: DNS query for nybooks.com failed: read udp 46.225.38.91:43032->8.8.8.8:53: i/o timeout

#8

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	nybooks-com.mail.protection.outlook.com	A 52.101.202.153 A 52.101.42.64 A 52.101.60.182 A 52.101.41.180 AAAA 2a01:111:f403:c922::7 AAAA 2a01:111:f403:c946::2 AAAA 2a01:111:f403:f901:: AAAA 2a01:111:f403:c927::1	mail-ph0pr02cu00101.inbound.protection.outlook.com ✓ mail-mw2pr05cu00100.inbound.protection.outlook.com ✓ mail-bn3pr0301cu00206.inbound.protection.outlook.com ✓ mail-byapr04cu00204.inbound.protection.outlook.com ✓ mail-blapr04cu00107.inbound.protection.outlook.com ✓ mail-ch4pr04cu00102.inbound.protection.outlook.com ✓ mail-bl3pr02cu00100.inbound.protection.outlook.com ✓ mail-bn8pr05cu00301.inbound.protection.outlook.com ✓

Checks

✓ 1 MX record #9

Found 1 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.
!

Single MX host, no backup

Only one MX record found. For better email reliability, consider adding at least one backup MX server.

#12
✓ At most 5 MX records #13

Found 1 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 8 MX addresss have a PTR record that resolves back to them.

TLS

warn

MTA-STS testing · TLS-RPT · DANE on 0 of 1 MX hosts

Found

MTA-STS record: v=STSv1; id=1704033894157
Policy URL: https://mta-sts.nybooks.com/.well-known/mta-sts.txt
Mode: testing
Allowed MX: nybooks-com.mail.protection.outlook.com
Max age: 86400 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:63850060df893@tls.dmarcly.com

DANE (TLSA records)

MX host	TLSA	DNSSEC
nybooks-com.mail.protection.outlook.com	none	-

Checks

✓ Record published #32

MTA-STS record found with id 1704033894157.
!

Policy in testing mode

With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.

#33
✓ All MX hosts covered #34

Every MX host matches an mx: line of the MTA-STS policy.
✓ Reports enabled #35

TLS reports are sent to: mailto:63850060df893@tls.dmarcly.com
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