Mail domain report: opendns.com

SPF

warn

SPF record published

Found

Record: v=spf1 ptr include:_nets.opendns.com include:mail.zendesk.com include:amazonses.com include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ip4:173.37.147.246 ip4:173.37.147.247 ip4:72.163.7.179 ip4:72.163.7.180 ip4:192.28.150.255 ?all
DNS lookups: 7 of 10
Void lookups: 0 of 2

Checks

!

Uses deprecated ptr mechanism

The ptr mechanism in SPF records is deprecated due to performance issues and should be avoided.

#1
✓ 7 of 10 DNS lookups #2

SPF record needs 7 DNS lookups (limit is 10).
!

Ends with ?all (neutral)

SPF record uses ?all (neutral), which gives no protection against unauthorized senders. Use -all or ~all instead.

#3
✓ 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

fail

p=none (_dmarc.opendns.com)

Found

Record: v=DMARC1; p=none; rua=mailto:hostmaster@opendns.com
Found at: _dmarc.opendns.com

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy
rua	mailto:hostmaster@opendns.com	Aggregate report addresses

Checks

✗

Policy: none (monitoring only)

DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.

#4
✓ Record published #5

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

DMARC record syntax is valid.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:hostmaster@opendns.com
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: default, mail, google

Found

Selectors: default, mail, google
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 1024 bits	test mode (t=y)
mail	RSA 1024 bits	test mode (t=y)
google	RSA 1024 bits

Checks

✓ Keys found: default, mail, google #7

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

1024-bit DKIM key

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

#23
!

Key in test mode

These keys have t=y, so receivers treat DKIM failures as a test: default, mail. Remove t=y once DKIM works.

#24

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

pass

3 mail servers

Found

Priority	Host	Records	Reverse DNS
10	alln-mx-01.cisco.com	A 173.37.147.230 AAAA 2001:420:1201:6::ad25:93e6	alln-mx-01.cisco.com ✓ alln-mx-01.cisco.com ✓
20	rcdn-mx-01.cisco.com	A 72.163.7.166 AAAA 2001:420:1101:7::48a3:166	rcdn-mx-01.cisco.com ✓ rcdn-mx-01.cisco.com ✓
30	aer-mx-01.cisco.com	A 173.38.212.150 AAAA 2001:420:4621::ad26:d496	aer-mx-01.cisco.com ✓ aer-mx-01.cisco.com ✓

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.
✓ 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 0 of 3 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
alln-mx-01.cisco.com	none	-
rcdn-mx-01.cisco.com	none	-
aer-mx-01.cisco.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