michelin.fr

SPF record published

Found

Record

v=spf1 include:spf.mandrillapp.com include:spf.mailgun.org include:servers.mcsv.net ?all

DNS lookups

3 of 10

Void lookups

1 of 2

Problem

include:spf.mailgun.org does not exist or has no records

Checks

• ✓ No deprecated ptr mechanism #1

  No ptr mechanism found in SPF record.
• !

  3 of 10 DNS lookups, with problems

  SPF record needs 3 DNS lookups (limit is 10). Problems found: include:spf.mailgun.org does not exist or has no records.

  #2
• !

  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.
• !

  1 void lookup

  1 include/redirect target does not exist or has no records (limit is 2). This usually is a stale include; remove it.

  #26
• ✓ No overly broad IP ranges #27

  All ip4/ip6 ranges are narrow enough.

Selectors: k1, mx

Found

Selectors

k1, mx

_domainkey

NOERROR

Checks

• ✓ Keys found: k1, mx #7

  DKIM keys found for this domain with selectors: k1, mx
• !

  1024-bit DKIM key

  1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits), mx (1024 bits). Rotate to a 2048-bit key.

  #23
• ✓ No problematic flags #24

  No keys in test mode, revoked, or limited to SHA-1.

4 mail servers

Found

Checks

• ✓ 4 MX records #9

  Found 4 MX records for this domain.
• !

  Hosts without IP addresses

  The following MX hosts could not be resolved to IP addresses: gk-fr1.michelin.com, gk-fr2.michelin.com, gk-us1.michelin.com, gk-us2.michelin.com

  #10
• !

  Hosts without IPv6

  The following MX hosts could not be resolved to IPv6 addresses: gk-fr1.michelin.com, gk-fr2.michelin.com, gk-us1.michelin.com, gk-us2.michelin.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.

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

Found

DANE (TLSA records)

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