toutiao.com

Checked 22 October 2026, 11:11 UTC · via 8.8.8.8
!Passed with warnings
22 passed 7 warnings 0 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:_spf.google.com include:spf.bytedance.com include:spf.lms.bytedance.com include:spf.em.bytedance.com ~all
DNS lookups
4 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 4 of 10 DNS lookups #2
    SPF record needs 4 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.toutiao.com)

Found

Record
v=DMARC1; p=quarantine; pct=100; rua=chenping@toutiao.com
Found at
_dmarc.toutiao.com
External report address
chenping@toutiao.com (only mailto: report addresses are supported by receivers)
TagValueMeaning
vDMARC1Version
pquarantinePolicy
pct100Percentage of mail the policy applies to
ruachenping@toutiao.comAggregate 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: chenping@toutiao.com
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • !
    Unsupported report address
    Receivers only send reports to mailto: addresses: chenping@toutiao.com.
    #29

DKIM

warn

Selectors: mail, google

Found

Selectors
mail, google
_domainkey
NXDOMAIN
SelectorKeyFlags
mailRSA 1024 bits
googleRSA 2048 bits

Checks

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

3 mail servers

Found

PriorityHostRecordsReverse DNS
10mx1.bytedance.comA 35.172.32.95ec2-35-172-32-95.compute-1.amazonaws.com ✓
20mx2.bytedance.comA 101.126.58.223 A 122.14.230.154lookup failed no PTR
30mx3.bytedance.comA 101.126.58.223 A 35.172.32.95 A 122.14.230.154 A 18.139.153.173lookup failed ec2-35-172-32-95.compute-1.amazonaws.com ✓ no PTR ec2-18-139-153-173.ap-southeast-1.compute.amazonaws.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.
  • !
    Hosts without IPv6
    The following MX hosts could not be resolved to IPv6 addresses: mx1.bytedance.com, mx2.bytedance.com, mx3.bytedance.com
    #11
  • ✓ 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: 122.14.230.154 (mx2.bytedance.com), 122.14.230.154 (mx3.bytedance.com). 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 hostTLSADNSSEC
mx1.bytedance.comnone-
mx2.bytedance.comnone-
mx3.bytedance.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