uschamber.com

Checked 22 October 2026, 11:16 UTC · via 8.8.8.8
✗Problems found
24 passed 4 warnings 1 failed 3 info

SPF

fail

SPF record published

Found

Record
v=spf1 ip4:128.177.108.46 ip4:209.3.198.0/24 ip4:38.70.10.69 ip4:216.200.160.161/28 ip4:216.185.15.192/26 ip4:103.151.192.0/23 ip4:185.12.80.0/22 ip4:188.172.128.0/20 ip4:192.161.144.0/20 ip4:216.198.0.0/18 include:spf.congressplus.com include:spf.protection.outlook.com include:email.prnewswire.com include:spf-00109201.pphosted.com include:cust-spf.exacttarget.com include:_spf.salesforce.com include:_spf.psm.knowbe4.com include:44883523.spf02.hubspotemail.net include:50705538.spf04.hubspotemail.net ip4:149.72.146.30 ip4:167.89.111.32 -all
DNS lookups
11 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✗
    11 DNS lookups, over the limit of 10
    SPF record needs 11 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • ✓ 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.uschamber.com)

Found

Record
v=DMARC1; p=reject; rua=mailto:postmaster@uschamber.com; ruf=mailto:postmaster@uschamber.com;
Found at
_dmarc.uschamber.com
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:postmaster@uschamber.comAggregate report addresses
rufmailto:postmaster@uschamber.comFailure report addresses

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:postmaster@uschamber.com
  • ✓ 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: selector1, s1, s2

Found

Selectors
selector1, s1, s2
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 2048 bits
s1RSA 2048 bits
s2RSA 1024 bits

Checks

  • ✓ Keys found: selector1, s1, s2 #7
    DKIM keys found for this domain with selectors: selector1, s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: s2 (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

4 mail servers

Found

PriorityHostRecordsReverse DNS
100mxa-00109201.gslb.pphosted.comA 67.231.152.53mx0b-00109201.pphosted.com ✓
100mxb-00109201.gslb.pphosted.comA 67.231.152.53mx0b-00109201.pphosted.com ✓
200mx0a-00109201.pphosted.comA 67.231.144.16mx0a-00109201.pphosted.com ✓
200mx0b-00109201.pphosted.comA 67.231.152.53mx0b-00109201.pphosted.com ✓

Checks

  • ✓ 4 MX records #9
    Found 4 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-00109201.gslb.pphosted.com, mxb-00109201.gslb.pphosted.com, mx0a-00109201.pphosted.com, mx0b-00109201.pphosted.com
    #11
  • ✓ Redundant MX hosts #12
    Found 4 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 4 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 4 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 4 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
mxa-00109201.gslb.pphosted.comnone-
mxb-00109201.gslb.pphosted.comnone-
mx0a-00109201.pphosted.comnone-
mx0b-00109201.pphosted.comnone-

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