DNS Report for substack.com

• ali.ns.cloudflare.com

  • IPv4: 172.64.32.59, 108.162.192.59, 173.245.58.59
  • IPv6: 2803:f800:50::6ca2:c03b, 2606:4700:50::adf5:3a3b, 2a06:98c1:50::ac40:203b
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• lee.ns.cloudflare.com

  • IPv4: 108.162.193.129, 172.64.33.129, 173.245.59.129
  • IPv6: 2606:4700:58::adf5:3b81, 2803:f800:50::6ca2:c181, 2a06:98c1:50::ac40:2181
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

Nameserver Count - OK

• ali.ns.cloudflare.com

  • Status: Responded
  • IP(s): 104.18.10.223, 104.18.11.223
  • TTL: 300 seconds
  • Recursive Queries: Allows recursive queries
  • TCP Connectivity: Allows TCP connections

• lee.ns.cloudflare.com

  • Status: Responded
  • IP(s): 104.18.10.223, 104.18.11.223
  • TTL: 300 seconds
  • Recursive Queries: Allows recursive queries
  • TCP Connectivity: Allows TCP connections

ali.ns.cloudflare.com

• Serial: 2347950691
• Refresh: 10000
• Retry: 2400
• Expire: 604800
• Minimum TTL: 1800

lee.ns.cloudflare.com

• Serial: 2347950691
• Refresh: 10000
• Retry: 2400
• Expire: 604800
• Minimum TTL: 1800

Serial: 2347950691 - OK

REFRESH: 10000 - OK

RETRY: 2400 - OK

EXPIRE: 604800 - OK

MINIMUM TTL: 1800 - Note: Outside recommended range (1-3 hours)

ali.ns.cloudflare.com

• 10 mxa.mailgun.org ( 34.149.236.64 )
• 10 mxb.mailgun.org ( 34.149.236.64 )

lee.ns.cloudflare.com

• 10 mxa.mailgun.org ( 34.149.236.64 )
• 10 mxb.mailgun.org ( 34.149.236.64 )

MX Record Consistency - OK

MX Record Count - OK

• 64.236.149.34.in-addr.arpa -> 64.236.149.34.bc.googleusercontent.com
• 64.236.149.34.in-addr.arpa -> 64.236.149.34.bc.googleusercontent.com

PTR Records - OK

• Signed: No
• Validation: Failed
• DNSKEY Records: None
• DS Records in parent zone: None
• DS at Parent: None

DNSSEC - Note: Domain is not signed with DNSSEC

Error: No DNSSEC records found

SPF Record Published: Passed

Multiple SPF Records: Passed

SPF Record 1:

• Record: v=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ~all
• SPF Syntax: Passed
• Deprecated Elements: Passed
• IP Addresses:
• Includes: _spf.google.com, mailgun.org, mail.zendesk.com
• DNS Lookups: 6
• Void Lookups: Passed
• Escaping Chars: Not Present
• All Mechanism: ~all

• DKIM Records Found: Yes
• Selectors Found: google
• Selector 'google':
  Record: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhSxZK3Q0YieBvcdcHojJLJQK1ooDVYtpjy3A7lEj/q6lDKTSAazT0jUd+AEUShEYBndvQ+RNwRJ1NEUtg686FGK9Vs7uX7iwGC+CuCuL4BvQ8W0ktGddMZv4mWs9ycrEpLFFBnixvN1kEXaQuyAb3o2hR SFYBkiybC5uCYggpL2nG/HTNHg5fMxMCH2HeaGm
• Valid Syntax: Yes

• Record: v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; sp=reject; aspf=r;
• Syntax: Valid
• Policy: reject
• Subdomain Policy: reject
• Percent: 100%
• RUA (Aggregate Reports): mailto:[email protected]
• SPF Alignment (aspf): Relaxed

DMARC External Validation:

• Valid external domains: dmarc.postmarkapp.com
• All external domains in your DMARC record are giving permission to send them DMARC reports.